644610364701250 has 40 divisors (see below), whose sum is σ = 1208270332127232. Its totient is φ = 257841443250000.

The previous prime is 644610364701211. The next prime is 644610364701257. The reversal of 644610364701250 is 52107463016446.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 644610364701194 and 644610364701203.

It is not an unprimeable number, because it can be changed into a prime (644610364701257) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 118784695 + ... + 124092805.

Almost surely, 2^{644610364701250} is an apocalyptic number.

644610364701250 is a deficient number, since it is larger than the sum of its proper divisors (563659967425982).

644610364701250 is an equidigital number, since it uses as much as digits as its factorization.

644610364701250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5405284 (or 5405269 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 49.

The spelling of 644610364701250 in words is "six hundred forty-four trillion, six hundred ten billion, three hundred sixty-four million, seven hundred one thousand, two hundred fifty".