66500131900 has 36 divisors (see below), whose sum is σ = 144427115448. Its totient is φ = 26577595840.

The previous prime is 66500131897. The next prime is 66500131927. The reversal of 66500131900 is 913100566.

It is a super-2 number, since 2×66500131900² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161419 + ... + 398818.

It is an arithmetic number, because the mean of its divisors is an integer number (4011864318).

Almost surely, 2^66500131900 is an apocalyptic number.

It is an amenable number.

66500131900 is an abundant number, since it is smaller than the sum of its proper divisors (77926983548).

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

66500131900 is a wasteful number, since it uses less digits than its factorization.

66500131900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561438 (or 561431 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 31.

The spelling of 66500131900 in words is "sixty-six billion, five hundred million, one hundred thirty-one thousand, nine hundred".