644618151052 has 24 divisors (see below), whose sum is σ = 1187530131200. Its totient is φ = 305325989136.

The previous prime is 644618150989. The next prime is 644618151061. The reversal of 644618151052 is 250151816446.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 967849 + ... + 1491967.

Almost surely, 2^644618151052 is an apocalyptic number.

It is an amenable number.

644618151052 is a deficient number, since it is larger than the sum of its proper divisors (542911980148).

644618151052 is a wasteful number, since it uses less digits than its factorization.

644618151052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540325 (or 540323 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 43.

Adding to 644618151052 its reverse (250151816446), we get a palindrome (894769967498).

The spelling of 644618151052 in words is "six hundred forty-four billion, six hundred eighteen million, one hundred fifty-one thousand, fifty-two".