66666396 has 24 divisors (see below), whose sum is σ = 155733760. Its totient is φ = 22196592.

The previous prime is 66666371. The next prime is 66666409. The reversal of 66666396 is 69366666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9795 + ... + 15141.

Almost surely, 2^66666396 is an apocalyptic number.

It is an amenable number.

66666396 is an abundant number, since it is smaller than the sum of its proper divisors (89067364).

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

66666396 is a wasteful number, since it uses less digits than its factorization.

66666396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6393 (or 6391 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 48.

The square root of 66666396 is about 8164.9492343798. The cubic root of 66666396 is about 405.4795842877.

The spelling of 66666396 in words is "sixty-six million, six hundred sixty-six thousand, three hundred ninety-six".