19938192677 has 12 divisors (see below), whose sum is σ = 21580898220. Its totient is φ = 18311527872.

The previous prime is 19938192667. The next prime is 19938192709. The reversal of 19938192677 is 77629183991.

It can be written as a sum of positive squares in 2 ways, for example, as 1680508036 + 18257684641 = 40994^2 + 135121^2 .

It is not a de Polignac number, because 19938192677 - 2¹² = 19938188581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19938192667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 495449 + ... + 534177.

It is an arithmetic number, because the mean of its divisors is an integer number (1798408185).

Almost surely, 2^19938192677 is an apocalyptic number.

It is an amenable number.

19938192677 is a deficient number, since it is larger than the sum of its proper divisors (1642705543).

19938192677 is an equidigital number, since it uses as much as digits as its factorization.

19938192677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39140 (or 38941 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 62.

The spelling of 19938192677 in words is "nineteen billion, nine hundred thirty-eight million, one hundred ninety-two thousand, six hundred seventy-seven".