661508160 has 56 divisors (see below), whose sum is σ = 2100291456. Its totient is φ = 176401920.

The previous prime is 661508153. The next prime is 661508167. The reversal of 661508160 is 61805166.

It is an interprime number because it is at equal distance from previous prime (661508153) and next prime (661508167).

It is not an unprimeable number, because it can be changed into a prime (661508167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343576 + ... + 345495.

Almost surely, 2^661508160 is an apocalyptic number.

661508160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

661508160 is an abundant number, since it is smaller than the sum of its proper divisors (1438783296).

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

661508160 is a wasteful number, since it uses less digits than its factorization.

661508160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689091 (or 689081 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 661508160 is about 25719.8009323556. The cubic root of 661508160 is about 871.3214427630.

The spelling of 661508160 in words is "six hundred sixty-one million, five hundred eight thousand, one hundred sixty".