791138181780 has 48 divisors (see below), whose sum is σ = 2461318789440. Its totient is φ = 210970181664.

The previous prime is 791138181767. The next prime is 791138181857. The reversal of 791138181780 is 87181831197.

791138181780 is a `hidden beast` number, since 7 + 91 + 1 + 381 + 8 + 178 + 0 = 666.

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

It is a congruent number.

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, 732534814 + ... + 732535893.

It is an arithmetic number, because the mean of its divisors is an integer number (51277474780).

Almost surely, 2^791138181780 is an apocalyptic number.

It is an amenable number.

791138181780 is an abundant number, since it is smaller than the sum of its proper divisors (1670180607660).

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

791138181780 is a wasteful number, since it uses less digits than its factorization.

791138181780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465070725 (or 1465070717 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 54.

The spelling of 791138181780 in words is "seven hundred ninety-one billion, one hundred thirty-eight million, one hundred eighty-one thousand, seven hundred eighty".