66578057 has 24 divisors (see below), whose sum is σ = 83131776. Its totient is φ = 52206336.

The previous prime is 66578053. The next prime is 66578063. The reversal of 66578057 is 75087566.

It is not a de Polignac number, because 66578057 - 2² = 66578053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66577999 and 66578017.

It is not an unprimeable number, because it can be changed into a prime (66578053) 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 23 ways as a sum of consecutive naturals, for example, 197393 + ... + 197729.

It is an arithmetic number, because the mean of its divisors is an integer number (3463824).

Almost surely, 2^66578057 is an apocalyptic number.

It is an amenable number.

66578057 is a deficient number, since it is larger than the sum of its proper divisors (16553719).

66578057 is a wasteful number, since it uses less digits than its factorization.

66578057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537 (or 524 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 44.

The square root of 66578057 is about 8159.5377932822. The cubic root of 66578057 is about 405.3004060898.

The spelling of 66578057 in words is "sixty-six million, five hundred seventy-eight thousand, fifty-seven".