644355211162 has 32 divisors (see below), whose sum is σ = 1054209300480. Its totient is φ = 293587856640.

The previous prime is 644355211147. The next prime is 644355211187. The reversal of 644355211162 is 261112553446.

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, 17528962 + ... + 17565682.

It is an arithmetic number, because the mean of its divisors is an integer number (32944040640).

Almost surely, 2^644355211162 is an apocalyptic number.

644355211162 is a deficient number, since it is larger than the sum of its proper divisors (409854089318).

644355211162 is a wasteful number, since it uses less digits than its factorization.

644355211162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45358.

The product of its digits is 172800, while the sum is 40.

The spelling of 644355211162 in words is "six hundred forty-four billion, three hundred fifty-five million, two hundred eleven thousand, one hundred sixty-two".