646450455464 has 64 divisors (see below), whose sum is σ = 1369601654400. Its totient is φ = 283351801600.

The previous prime is 646450455383. The next prime is 646450455481. The reversal of 646450455464 is 464554054646.

It is a happy number.

It is a super-2 number, since 2×646450455464² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1875029 + ... + 2192859.

It is an arithmetic number, because the mean of its divisors is an integer number (21400025850).

Almost surely, 2^646450455464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646450455464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (684800827200).

646450455464 is an abundant number, since it is smaller than the sum of its proper divisors (723151198936).

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

646450455464 is a wasteful number, since it uses less digits than its factorization.

646450455464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318674 (or 318670 counting only the distinct ones).

The product of its (nonzero) digits is 27648000, while the sum is 53.

The spelling of 646450455464 in words is "six hundred forty-six billion, four hundred fifty million, four hundred fifty-five thousand, four hundred sixty-four".