19877854779 has 6 divisors (see below), whose sum is σ = 28712456916. Its totient is φ = 13251903180.

The previous prime is 19877854723. The next prime is 19877854783. The reversal of 19877854779 is 97745877891.

19877854779 is a `hidden beast` number, since 1 + 9 + 8 + 7 + 7 + 8 + 547 + 79 = 666.

It is not a de Polignac number, because 19877854779 - 2¹³ = 19877846587 is a prime.

It is a super-2 number, since 2×19877854779² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19877858779) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1104325257 + ... + 1104325274.

It is an arithmetic number, because the mean of its divisors is an integer number (4785409486).

Almost surely, 2^19877854779 is an apocalyptic number.

19877854779 is a deficient number, since it is larger than the sum of its proper divisors (8834602137).

19877854779 is a wasteful number, since it uses less digits than its factorization.

19877854779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2208650537 (or 2208650534 counting only the distinct ones).

The product of its digits is 248935680, while the sum is 72.

The spelling of 19877854779 in words is "nineteen billion, eight hundred seventy-seven million, eight hundred fifty-four thousand, seven hundred seventy-nine".