66557732 has 12 divisors (see below), whose sum is σ = 116852736. Its totient is φ = 33171240.

The previous prime is 66557717. The next prime is 66557759. The reversal of 66557732 is 23775566.

It is a self number, because there is not a number n which added to its sum of digits gives 66557732.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25508 + ... + 27995.

It is an arithmetic number, because the mean of its divisors is an integer number (9737728).

Almost surely, 2^66557732 is an apocalyptic number.

It is an amenable number.

66557732 is a deficient number, since it is larger than the sum of its proper divisors (50295004).

66557732 is a wasteful number, since it uses less digits than its factorization.

66557732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53818 (or 53816 counting only the distinct ones).

The product of its digits is 264600, while the sum is 41.

The square root of 66557732 is about 8158.2922232536. The cubic root of 66557732 is about 405.2591584198.

The spelling of 66557732 in words is "sixty-six million, five hundred fifty-seven thousand, seven hundred thirty-two".