646873382841400 has 96 divisors (see below), whose sum is σ = 1766914289154000. Its totient is φ = 217132324300800.

The previous prime is 646873382841397. The next prime is 646873382841421. The reversal of 646873382841400 is 4148283378646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11308946625 + ... + 11309003824.

Almost surely, 2^{646873382841400} is an apocalyptic number.

It is an amenable number.

646873382841400 is an abundant number, since it is smaller than the sum of its proper divisors (1120040906312600).

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

646873382841400 is a wasteful number, since it uses less digits than its factorization.

646873382841400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22617950489 (or 22617950480 counting only the distinct ones).

The product of its (nonzero) digits is 148635648, while the sum is 64.

The spelling of 646873382841400 in words is "six hundred forty-six trillion, eight hundred seventy-three billion, three hundred eighty-two million, eight hundred forty-one thousand, four hundred".