81779296922 has 8 divisors (see below), whose sum is σ = 124146884736. Its totient is φ = 40397002012.

The previous prime is 81779296903. The next prime is 81779296967. The reversal of 81779296922 is 22969297718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246323018 + ... + 246323349.

It is an arithmetic number, because the mean of its divisors is an integer number (15518360592).

Almost surely, 2^81779296922 is an apocalyptic number.

81779296922 is a deficient number, since it is larger than the sum of its proper divisors (42367587814).

81779296922 is a wasteful number, since it uses less digits than its factorization.

81779296922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492646452.

The product of its digits is 13716864, while the sum is 62.

The spelling of 81779296922 in words is "eighty-one billion, seven hundred seventy-nine million, two hundred ninety-six thousand, nine hundred twenty-two".