19839761655 has 48 divisors (see below), whose sum is σ = 36941171040. Its totient is φ = 9065941248.

The previous prime is 19839761629. The next prime is 19839761671. The reversal of 19839761655 is 55616793891.

It is not a de Polignac number, because 19839761655 - 2¹⁶ = 19839696119 is a prime.

It is a super-2 number, since 2×19839761655² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2787241 + ... + 2794349.

It is an arithmetic number, because the mean of its divisors is an integer number (769607730).

Almost surely, 2^19839761655 is an apocalyptic number.

19839761655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19839761655 is a deficient number, since it is larger than the sum of its proper divisors (17101409385).

19839761655 is a wasteful number, since it uses less digits than its factorization.

19839761655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10928 (or 10921 counting only the distinct ones).

The product of its digits is 12247200, while the sum is 60.

The spelling of 19839761655 in words is "nineteen billion, eight hundred thirty-nine million, seven hundred sixty-one thousand, six hundred fifty-five".