645266160 has 480 divisors, whose sum is σ = 2752109568. Its totient is φ = 131604480.

The previous prime is 645266143. The next prime is 645266189. The reversal of 645266160 is 61662546.

It is a happy number.

645266160 is a `hidden beast` number, since 645 + 2 + 6 + 6 + 1 + 6 + 0 = 666.

It is a super-2 number, since 2×645266160² = 832736834482291200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 5710264 + ... + 5710376.

Almost surely, 2^645266160 is an apocalyptic number.

645266160 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 645266160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1376054784).

645266160 is an abundant number, since it is smaller than the sum of its proper divisors (2106843408).

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

645266160 is a wasteful number, since it uses less digits than its factorization.

645266160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 645266160 is about 25402.0896778198. The cubic root of 645266160 is about 864.1310886489.

The spelling of 645266160 in words is "six hundred forty-five million, two hundred sixty-six thousand, one hundred sixty".