66077538 has 48 divisors (see below), whose sum is σ = 143233920. Its totient is φ = 20310784.

The previous prime is 66077509. The next prime is 66077549. The reversal of 66077538 is 83577066.

It is a self number, because there is not a number n which added to its sum of digits gives 66077538.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91543 + ... + 92261.

It is an arithmetic number, because the mean of its divisors is an integer number (2984040).

Almost surely, 2^66077538 is an apocalyptic number.

66077538 is an abundant number, since it is smaller than the sum of its proper divisors (77156382).

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

66077538 is a wasteful number, since it uses less digits than its factorization.

66077538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811 (or 794 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 66077538 is about 8128.8091378750. The cubic root of 66077538 is about 404.2821975365.

The spelling of 66077538 in words is "sixty-six million, seventy-seven thousand, five hundred thirty-eight".