66772057 has 4 divisors (see below), whose sum is σ = 72842256. Its totient is φ = 60701860.

The previous prime is 66772051. The next prime is 66772093. The reversal of 66772057 is 75027766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66772057 - 2¹⁵ = 66739289 is a prime.

It is a super-2 number, since 2×66772057² = 8917015192022498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66772051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3035083 + ... + 3035104.

It is an arithmetic number, because the mean of its divisors is an integer number (18210564).

Almost surely, 2^66772057 is an apocalyptic number.

It is an amenable number.

66772057 is a deficient number, since it is larger than the sum of its proper divisors (6070199).

66772057 is a wasteful number, since it uses less digits than its factorization.

66772057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6070198.

The product of its (nonzero) digits is 123480, while the sum is 40.

The square root of 66772057 is about 8171.4170741677. The cubic root of 66772057 is about 405.6936889760.

The spelling of 66772057 in words is "sixty-six million, seven hundred seventy-two thousand, fifty-seven".