19157779044 has 48 divisors (see below), whose sum is σ = 51010713600. Its totient is φ = 6213332448.

The previous prime is 19157779031. The next prime is 19157779051. The reversal of 19157779044 is 44097775191.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2393124 + ... + 2401115.

It is an arithmetic number, because the mean of its divisors is an integer number (1062723200).

Almost surely, 2^19157779044 is an apocalyptic number.

It is an amenable number.

19157779044 is an abundant number, since it is smaller than the sum of its proper divisors (31852934556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19157779044 is a wasteful number, since it uses less digits than its factorization.

19157779044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4794289 (or 4794281 counting only the distinct ones).

The product of its (nonzero) digits is 2222640, while the sum is 54.

The spelling of 19157779044 in words is "nineteen billion, one hundred fifty-seven million, seven hundred seventy-nine thousand, forty-four".