19494931616 has 12 divisors (see below), whose sum is σ = 38380646682. Its totient is φ = 9747465792.

The previous prime is 19494931601. The next prime is 19494931639. The reversal of 19494931616 is 61613949491.

It can be written as a sum of positive squares in only one way, i.e., 10282771216 + 9212160400 = 101404^2 + 95980^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304608275 + ... + 304608338.

Almost surely, 2^19494931616 is an apocalyptic number.

19494931616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19494931616 is a deficient number, since it is larger than the sum of its proper divisors (18885715066).

19494931616 is an equidigital number, since it uses as much as digits as its factorization.

19494931616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609216623 (or 609216615 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 53.

The spelling of 19494931616 in words is "nineteen billion, four hundred ninety-four million, nine hundred thirty-one thousand, six hundred sixteen".