66774575 has 12 divisors (see below), whose sum is σ = 94629360. Its totient is φ = 45788160.

The previous prime is 66774563. The next prime is 66774581. The reversal of 66774575 is 57547766.

It is not a de Polignac number, because 66774575 - 2⁸ = 66774319 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 190610 + ... + 190959.

It is an arithmetic number, because the mean of its divisors is an integer number (7885780).

Almost surely, 2^66774575 is an apocalyptic number.

66774575 is a deficient number, since it is larger than the sum of its proper divisors (27854785).

66774575 is a wasteful number, since it uses less digits than its factorization.

66774575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381586 (or 381581 counting only the distinct ones).

The product of its digits is 1234800, while the sum is 47.

The square root of 66774575 is about 8171.5711463586. The cubic root of 66774575 is about 405.6987885337.

The spelling of 66774575 in words is "sixty-six million, seven hundred seventy-four thousand, five hundred seventy-five".