646708502440 has 128 divisors (see below), whose sum is σ = 1953692939520. Its totient is φ = 186065971200.

The previous prime is 646708502417. The next prime is 646708502441. The reversal of 646708502440 is 44205807646.

It is a happy number.

646708502440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (646708502441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8035741 + ... + 8115820.

It is an arithmetic number, because the mean of its divisors is an integer number (15263226090).

Almost surely, 2^646708502440 is an apocalyptic number.

It is an amenable number.

646708502440 is an abundant number, since it is smaller than the sum of its proper divisors (1306984437080).

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

646708502440 is a wasteful number, since it uses less digits than its factorization.

646708502440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16151603 (or 16151599 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 46.

The spelling of 646708502440 in words is "six hundred forty-six billion, seven hundred eight million, five hundred two thousand, four hundred forty".