66894377574 has 32 divisors (see below), whose sum is σ = 135170592480. Its totient is φ = 22068288000.

The previous prime is 66894377569. The next prime is 66894377581. The reversal of 66894377574 is 47577349866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518124 + ... + 634224.

It is an arithmetic number, because the mean of its divisors is an integer number (4224081015).

Almost surely, 2^66894377574 is an apocalyptic number.

66894377574 is an abundant number, since it is smaller than the sum of its proper divisors (68276214906).

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

66894377574 is a wasteful number, since it uses less digits than its factorization.

66894377574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117096.

The product of its digits is 213373440, while the sum is 66.

The spelling of 66894377574 in words is "sixty-six billion, eight hundred ninety-four million, three hundred seventy-seven thousand, five hundred seventy-four".