646306515444 has 48 divisors (see below), whose sum is σ = 1513704281600. Its totient is φ = 214628805216.

The previous prime is 646306515433. The next prime is 646306515473. The reversal of 646306515444 is 444515603646.

It is a super-2 number, since 2×646306515444² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 646306515393 and 646306515402.

It is a congruent number.

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, 4046697 + ... + 4203375.

Almost surely, 2^646306515444 is an apocalyptic number.

It is an amenable number.

646306515444 is an abundant number, since it is smaller than the sum of its proper divisors (867397766156).

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

646306515444 is a wasteful number, since it uses less digits than its factorization.

646306515444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157972 (or 157970 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 48.

The spelling of 646306515444 in words is "six hundred forty-six billion, three hundred six million, five hundred fifteen thousand, four hundred forty-four".