66123057 has 64 divisors (see below), whose sum is σ = 120121344. Its totient is φ = 31242240.

The previous prime is 66123053. The next prime is 66123067. The reversal of 66123057 is 75032166.

It is not a de Polignac number, because 66123057 - 2² = 66123053 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66123053) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 291178 + ... + 291404.

It is an arithmetic number, because the mean of its divisors is an integer number (1876896).

Almost surely, 2^66123057 is an apocalyptic number.

It is an amenable number.

66123057 is a deficient number, since it is larger than the sum of its proper divisors (53998287).

66123057 is a wasteful number, since it uses less digits than its factorization.

66123057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 66123057 is about 8131.6085124654. The cubic root of 66123057 is about 404.3750091931.

It can be divided in two parts, 6612 and 3057, that added together give a palindrome (9669).

The spelling of 66123057 in words is "sixty-six million, one hundred twenty-three thousand, fifty-seven".