66216057 has 16 divisors (see below), whose sum is σ = 92479488. Its totient is φ = 42063120.

The previous prime is 66216053. The next prime is 66216097. The reversal of 66216057 is 75061266.

It is not a de Polignac number, because 66216057 - 2² = 66216053 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66216053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17832 + ... + 21222.

It is an arithmetic number, because the mean of its divisors is an integer number (5779968).

Almost surely, 2^66216057 is an apocalyptic number.

It is an amenable number.

66216057 is a deficient number, since it is larger than the sum of its proper divisors (26263431).

66216057 is a wasteful number, since it uses less digits than its factorization.

66216057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3700.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 66216057 is about 8137.3249289923. The cubic root of 66216057 is about 404.5645006271.

The spelling of 66216057 in words is "sixty-six million, two hundred sixteen thousand, fifty-seven".