66465401256 has 64 divisors (see below), whose sum is σ = 185002430400. Its totient is φ = 22109976000.

The previous prime is 66465401251. The next prime is 66465401257. The reversal of 66465401256 is 65210456466.

66465401256 is a `hidden beast` number, since 6 + 6 + 46 + 540 + 12 + 56 = 666.

It is not an unprimeable number, because it can be changed into a prime (66465401251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207295 + ... + 419406.

It is an arithmetic number, because the mean of its divisors is an integer number (2890662975).

Almost surely, 2^66465401256 is an apocalyptic number.

It is an amenable number.

66465401256 is an abundant number, since it is smaller than the sum of its proper divisors (118537029144).

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

66465401256 is a wasteful number, since it uses less digits than its factorization.

66465401256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627207 (or 627197 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 66465401256 in words is "sixty-six billion, four hundred sixty-five million, four hundred one thousand, two hundred fifty-six".