646662222400 has 84 divisors (see below), whose sum is σ = 1660375639872. Its totient is φ = 247418575360.

The previous prime is 646662222397. The next prime is 646662222449. The reversal of 646662222400 is 4222266646.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8749372 + ... + 8822971.

Almost surely, 2^646662222400 is an apocalyptic number.

It is an amenable number.

646662222400 is an abundant number, since it is smaller than the sum of its proper divisors (1013713417472).

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

646662222400 is a wasteful number, since it uses less digits than its factorization.

646662222400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17572388 (or 17572373 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

The spelling of 646662222400 in words is "six hundred forty-six billion, six hundred sixty-two million, two hundred twenty-two thousand, four hundred".