19612779855 has 32 divisors (see below), whose sum is σ = 31638168000. Its totient is φ = 10374454272.

The previous prime is 19612779833. The next prime is 19612779859. The reversal of 19612779855 is 55897721691.

It is not a de Polignac number, because 19612779855 - 2¹⁸ = 19612517711 is a prime.

It is a super-2 number, since 2×19612779855² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19612779859) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1578427 + ... + 1590803.

It is an arithmetic number, because the mean of its divisors is an integer number (988692750).

Almost surely, 2^19612779855 is an apocalyptic number.

19612779855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19612779855 is a deficient number, since it is larger than the sum of its proper divisors (12025388145).

19612779855 is a wasteful number, since it uses less digits than its factorization.

19612779855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13243.

The product of its digits is 9525600, while the sum is 60.

The spelling of 19612779855 in words is "nineteen billion, six hundred twelve million, seven hundred seventy-nine thousand, eight hundred fifty-five".