66774544 has 10 divisors (see below), whose sum is σ = 129375710. Its totient is φ = 33387264.

The previous prime is 66774523. The next prime is 66774553. The reversal of 66774544 is 44547766.

It can be written as a sum of positive squares in only one way, i.e., 62726400 + 4048144 = 7920^2 + 2012^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66774544.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2086689 + ... + 2086720.

It is an arithmetic number, because the mean of its divisors is an integer number (12937571).

Almost surely, 2^66774544 is an apocalyptic number.

It is an amenable number.

66774544 is a deficient number, since it is larger than the sum of its proper divisors (62601166).

66774544 is a wasteful number, since it uses less digits than its factorization.

66774544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4173417 (or 4173411 counting only the distinct ones).

The product of its digits is 564480, while the sum is 43.

The square root of 66774544 is about 8171.5692495383. The cubic root of 66774544 is about 405.6987257520.

The spelling of 66774544 in words is "sixty-six million, seven hundred seventy-four thousand, five hundred forty-four".