131665880 has 16 divisors (see below), whose sum is σ = 296248320. Its totient is φ = 52666336.

The previous prime is 131665841. The next prime is 131665889. The reversal of 131665880 is 88566131.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131665889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1645784 + ... + 1645863.

It is an arithmetic number, because the mean of its divisors is an integer number (18515520).

Almost surely, 2^131665880 is an apocalyptic number.

131665880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131665880 is an abundant number, since it is smaller than the sum of its proper divisors (164582440).

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

131665880 is a wasteful number, since it uses less digits than its factorization.

131665880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3291658 (or 3291654 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 131665880 is about 11474.5753734071. The cubic root of 131665880 is about 508.7343730045.

The spelling of 131665880 in words is "one hundred thirty-one million, six hundred sixty-five thousand, eight hundred eighty".