66402456 has 16 divisors (see below), whose sum is σ = 166006200. Its totient is φ = 22134144.

The previous prime is 66402439. The next prime is 66402461. The reversal of 66402456 is 65420466.

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, 1383361 + ... + 1383408.

Almost surely, 2^66402456 is an apocalyptic number.

It is an amenable number.

66402456 is an abundant number, since it is smaller than the sum of its proper divisors (99603744).

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

66402456 is a wasteful number, since it uses less digits than its factorization.

66402456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2766778 (or 2766774 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 66402456 is about 8148.7702139648. The cubic root of 66402456 is about 404.9437629581.

The spelling of 66402456 in words is "sixty-six million, four hundred two thousand, four hundred fifty-six".