66674067920 has 20 divisors (see below), whose sum is σ = 155017208100. Its totient is φ = 26669627136.

The previous prime is 66674067913. The next prime is 66674067961. The reversal of 66674067920 is 2976047666.

It can be written as a sum of positive squares in 2 ways, for example, as 8639330704 + 58034737216 = 92948^2 + 240904^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (53) 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, 416712845 + ... + 416713004.

It is an arithmetic number, because the mean of its divisors is an integer number (7750860405).

Almost surely, 2^66674067920 is an apocalyptic number.

It is an amenable number.

66674067920 is an abundant number, since it is smaller than the sum of its proper divisors (88343140180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66674067920 is a wasteful number, since it uses less digits than its factorization.

66674067920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833425862 (or 833425856 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 53.

The spelling of 66674067920 in words is "sixty-six billion, six hundred seventy-four million, sixty-seven thousand, nine hundred twenty".