128937531966 has 16 divisors (see below), whose sum is σ = 262740631824. Its totient is φ = 42168249344.

The previous prime is 128937531959. The next prime is 128937531971. The reversal of 128937531966 is 669135739821.

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, 202731651 + ... + 202732286.

It is an arithmetic number, because the mean of its divisors is an integer number (16421289489).

Almost surely, 2^128937531966 is an apocalyptic number.

128937531966 is an abundant number, since it is smaller than the sum of its proper divisors (133803099858).

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

128937531966 is a wasteful number, since it uses less digits than its factorization.

128937531966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405463995.

The product of its digits is 14696640, while the sum is 60.

The spelling of 128937531966 in words is "one hundred twenty-eight billion, nine hundred thirty-seven million, five hundred thirty-one thousand, nine hundred sixty-six".