66001565456 has 20 divisors (see below), whose sum is σ = 127882810512. Its totient is φ = 32999549856.

The previous prime is 66001565453. The next prime is 66001565489. The reversal of 66001565456 is 65456510066.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66001565453) 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, 491915 + ... + 611541.

Almost surely, 2^66001565456 is an apocalyptic number.

It is an amenable number.

66001565456 is a deficient number, since it is larger than the sum of its proper divisors (61881245056).

66001565456 is a wasteful number, since it uses less digits than its factorization.

66001565456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154118 (or 154112 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 44.

The spelling of 66001565456 in words is "sixty-six billion, one million, five hundred sixty-five thousand, four hundred fifty-six".