661963160 has 32 divisors (see below), whose sum is σ = 1492648560. Its totient is φ = 264210816.

The previous prime is 661963157. The next prime is 661963171. The reversal of 661963160 is 61369166.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 962 + ... + 36398.

Almost surely, 2^661963160 is an apocalyptic number.

It is an amenable number.

661963160 is an abundant number, since it is smaller than the sum of its proper divisors (830685400).

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

661963160 is a wasteful number, since it uses less digits than its factorization.

661963160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35915 (or 35911 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 661963160 is about 25728.6447369464. The cubic root of 661963160 is about 871.5211683895.

The spelling of 661963160 in words is "six hundred sixty-one million, nine hundred sixty-three thousand, one hundred sixty".