819591051942 has 32 divisors (see below), whose sum is σ = 1961414484960. Its totient is φ = 252181861920.

The previous prime is 819591051911. The next prime is 819591051943. The reversal of 819591051942 is 249150195918.

819591051942 is a `hidden beast` number, since 8 + 1 + 9 + 591 + 0 + 5 + 1 + 9 + 42 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819591051943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 583753609 + ... + 583755012.

It is an arithmetic number, because the mean of its divisors is an integer number (61294202655).

Almost surely, 2^819591051942 is an apocalyptic number.

819591051942 is an abundant number, since it is smaller than the sum of its proper divisors (1141823433018).

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

819591051942 is a wasteful number, since it uses less digits than its factorization.

819591051942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167508645 (or 1167508639 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 54.

The spelling of 819591051942 in words is "eight hundred nineteen billion, five hundred ninety-one million, fifty-one thousand, nine hundred forty-two".