79491191057 has 8 divisors (see below), whose sum is σ = 80843664480. Its totient is φ = 78138889920.

The previous prime is 79491191051. The next prime is 79491191069. The reversal of 79491191057 is 75019119497.

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

It is a cyclic number.

It is not a de Polignac number, because 79491191057 - 2⁶ = 79491190993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79491191051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1180457 + ... + 1245977.

It is an arithmetic number, because the mean of its divisors is an integer number (10105458060).

Almost surely, 2^79491191057 is an apocalyptic number.

It is an amenable number.

79491191057 is a deficient number, since it is larger than the sum of its proper divisors (1352473423).

79491191057 is a wasteful number, since it uses less digits than its factorization.

79491191057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86143.

The product of its (nonzero) digits is 714420, while the sum is 53.

The spelling of 79491191057 in words is "seventy-nine billion, four hundred ninety-one million, one hundred ninety-one thousand, fifty-seven".