6641653680 has 240 divisors, whose sum is σ = 23573178720. Its totient is φ = 1671155712.

The previous prime is 6641653651. The next prime is 6641653691. The reversal of 6641653680 is 863561466.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×6641653680² = 88223127210115084800, which contains 22 as substring.

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 47 ways as a sum of consecutive naturals, for example, 4007412 + ... + 4009068.

It is an arithmetic number, because the mean of its divisors is an integer number (98221578).

Almost surely, 2^6641653680 is an apocalyptic number.

6641653680 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 6641653680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11786589360).

6641653680 is an abundant number, since it is smaller than the sum of its proper divisors (16931525040).

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

6641653680 is a wasteful number, since it uses less digits than its factorization.

6641653680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988 (or 1979 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 6641653680 is about 81496.3415129784. The cubic root of 6641653680 is about 1879.7152956526.

The spelling of 6641653680 in words is "six billion, six hundred forty-one million, six hundred fifty-three thousand, six hundred eighty".