19612275644 has 48 divisors (see below), whose sum is σ = 37557051168. Its totient is φ = 8906312448.

The previous prime is 19612275637. The next prime is 19612275659. The reversal of 19612275644 is 44657221691.

It is a super-2 number, since 2×19612275644² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3526514 + ... + 3532070.

It is an arithmetic number, because the mean of its divisors is an integer number (782438566).

Almost surely, 2^19612275644 is an apocalyptic number.

It is an amenable number.

19612275644 is a deficient number, since it is larger than the sum of its proper divisors (17944775524).

19612275644 is a wasteful number, since it uses less digits than its factorization.

19612275644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6654 (or 6652 counting only the distinct ones).

The product of its digits is 725760, while the sum is 47.

The spelling of 19612275644 in words is "nineteen billion, six hundred twelve million, two hundred seventy-five thousand, six hundred forty-four".