66819572 has 12 divisors (see below), whose sum is σ = 117119520. Its totient is φ = 33356856.

The previous prime is 66819559. The next prime is 66819581. The reversal of 66819572 is 27591866.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10322 + ... + 15497.

It is an arithmetic number, because the mean of its divisors is an integer number (9759960).

Almost surely, 2^66819572 is an apocalyptic number.

It is an amenable number.

66819572 is a deficient number, since it is larger than the sum of its proper divisors (50299948).

66819572 is a wasteful number, since it uses less digits than its factorization.

66819572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26470 (or 26468 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 66819572 is about 8174.3239475812. The cubic root of 66819572 is about 405.7898967107.

The spelling of 66819572 in words is "sixty-six million, eight hundred nineteen thousand, five hundred seventy-two".