66137431672 has 64 divisors (see below), whose sum is σ = 134205926400. Its totient is φ = 30374663040.

The previous prime is 66137431637. The next prime is 66137431673. The reversal of 66137431672 is 27613473166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66137431673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23900833 + ... + 23903599.

It is an arithmetic number, because the mean of its divisors is an integer number (2096967600).

Almost surely, 2^66137431672 is an apocalyptic number.

It is an amenable number.

66137431672 is an abundant number, since it is smaller than the sum of its proper divisors (68068494728).

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

66137431672 is a wasteful number, since it uses less digits than its factorization.

66137431672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3836 (or 3832 counting only the distinct ones).

The product of its digits is 762048, while the sum is 46.

The spelling of 66137431672 in words is "sixty-six billion, one hundred thirty-seven million, four hundred thirty-one thousand, six hundred seventy-two".