6657361920 has 576 divisors, whose sum is σ = 26142480000. Its totient is φ = 1605795840.

The previous prime is 6657361897. The next prime is 6657361927. The reversal of 6657361920 is 291637566.

6657361920 is a `hidden beast` number, since 6 + 6 + 5 + 7 + 3 + 619 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a super-3 number, since 3×6657361920³ (a number of 30 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (6657361927) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33453981 + ... + 33454179.

It is an arithmetic number, because the mean of its divisors is an integer number (45386250).

Almost surely, 2^6657361920 is an apocalyptic number.

6657361920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6657361920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13071240000).

6657361920 is an abundant number, since it is smaller than the sum of its proper divisors (19485118080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6657361920 is a wasteful number, since it uses less digits than its factorization.

6657361920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 6657361920 is about 81592.6584932738. The cubic root of 6657361920 is about 1881.1960398941.

The spelling of 6657361920 in words is "six billion, six hundred fifty-seven million, three hundred sixty-one thousand, nine hundred twenty".