644533464470 has 16 divisors (see below), whose sum is σ = 1325897412768. Its totient is φ = 220982902080.

The previous prime is 644533464469. The next prime is 644533464479. The reversal of 644533464470 is 74464335446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644533464479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4603810391 + ... + 4603810530.

It is an arithmetic number, because the mean of its divisors is an integer number (82868588298).

Almost surely, 2^644533464470 is an apocalyptic number.

644533464470 is an abundant number, since it is smaller than the sum of its proper divisors (681363948298).

644533464470 is a wasteful number, since it uses less digits than its factorization.

644533464470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9207620935.

The product of its (nonzero) digits is 11612160, while the sum is 50.

The spelling of 644533464470 in words is "six hundred forty-four billion, five hundred thirty-three million, four hundred sixty-four thousand, four hundred seventy".