79180672981 has 2 divisors, whose sum is σ = 79180672982. Its totient is φ = 79180672980.

The previous prime is 79180672951. The next prime is 79180672997. The reversal of 79180672981 is 18927608197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46627492356 + 32553180625 = 215934^2 + 180425^2 .

It is an emirp because it is prime and its reverse (18927608197) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79180672981 - 2⁷ = 79180672853 is a prime.

It is a super-2 number, since 2×79180672981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79180672951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39590336490 + 39590336491.

It is an arithmetic number, because the mean of its divisors is an integer number (39590336491).

Almost surely, 2^79180672981 is an apocalyptic number.

It is an amenable number.

79180672981 is a deficient number, since it is larger than the sum of its proper divisors (1).

79180672981 is an equidigital number, since it uses as much as digits as its factorization.

79180672981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3048192, while the sum is 58.

The spelling of 79180672981 in words is "seventy-nine billion, one hundred eighty million, six hundred seventy-two thousand, nine hundred eighty-one".