6645980160 has 264 divisors, whose sum is σ = 23164343280. Its totient is φ = 1761804288.

The previous prime is 6645980101. The next prime is 6645980171. The reversal of 6645980160 is 610895466.

6645980160 is a `hidden beast` number, since 66 + 459 + 80 + 1 + 60 = 666.

It is a super-2 number, since 2×6645980160² = 88338104574227251200, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10736331 + ... + 10736949.

Almost surely, 2^6645980160 is an apocalyptic number.

6645980160 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 6645980160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11582171640).

6645980160 is an abundant number, since it is smaller than the sum of its proper divisors (16518363120).

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

6645980160 is a wasteful number, since it uses less digits than its factorization.

6645980160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883 (or 862 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 6645980160 is about 81522.8812052175. The cubic root of 6645980160 is about 1880.1233659803.

The spelling of 6645980160 in words is "six billion, six hundred forty-five million, nine hundred eighty thousand, one hundred sixty".