74665856648 has 16 divisors (see below), whose sum is σ = 144826015500. Its totient is φ = 36045585856.

The previous prime is 74665856647. The next prime is 74665856687. The reversal of 74665856648 is 84665856647.

It can be written as a sum of positive squares in 2 ways, for example, as 67819618084 + 6846238564 = 260422^2 + 82742^2 .

It is not an unprimeable number, because it can be changed into a prime (74665856647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160917563 + ... + 160918026.

Almost surely, 2^74665856648 is an apocalyptic number.

It is an amenable number.

74665856648 is a deficient number, since it is larger than the sum of its proper divisors (70160158852).

74665856648 is a wasteful number, since it uses less digits than its factorization.

74665856648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321835624 (or 321835620 counting only the distinct ones).

The product of its digits is 232243200, while the sum is 65.

Subtracting 74665856648 from its reverse (84665856647), we obtain a palindrome (9999999999).

The spelling of 74665856648 in words is "seventy-four billion, six hundred sixty-five million, eight hundred fifty-six thousand, six hundred forty-eight".