6551269920 has 576 divisors, whose sum is σ = 25724200320. Its totient is φ = 1504935936.

The previous prime is 6551269909. The next prime is 6551269937. The reversal of 6551269920 is 299621556.

It is a happy number.

6551269920 is a `hidden beast` number, since 6 + 551 + 2 + 6 + 9 + 92 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 40191759 + ... + 40191921.

It is an arithmetic number, because the mean of its divisors is an integer number (44660070).

Almost surely, 2^6551269920 is an apocalyptic number.

6551269920 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 6551269920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12862100160).

6551269920 is an abundant number, since it is smaller than the sum of its proper divisors (19172930400).

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

6551269920 is a wasteful number, since it uses less digits than its factorization.

6551269920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The square root of 6551269920 is about 80939.9154929136. The cubic root of 6551269920 is about 1871.1495424670.

The spelling of 6551269920 in words is "six billion, five hundred fifty-one million, two hundred sixty-nine thousand, nine hundred twenty".