644724774141 has 32 divisors (see below), whose sum is σ = 1003704649728. Its totient is φ = 360511905600.

The previous prime is 644724774079. The next prime is 644724774149. The reversal of 644724774141 is 141477427446.

It is not a de Polignac number, because 644724774141 - 2³⁴ = 627544904957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644724774149) 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, 1304850 + ... + 1729763.

It is an arithmetic number, because the mean of its divisors is an integer number (31365770304).

Almost surely, 2^644724774141 is an apocalyptic number.

It is an amenable number.

644724774141 is a deficient number, since it is larger than the sum of its proper divisors (358979875587).

644724774141 is a wasteful number, since it uses less digits than its factorization.

644724774141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3034841.

The product of its digits is 4214784, while the sum is 51.

The spelling of 644724774141 in words is "six hundred forty-four billion, seven hundred twenty-four million, seven hundred seventy-four thousand, one hundred forty-one".