79879927157 has 2 divisors, whose sum is σ = 79879927158. Its totient is φ = 79879927156.

The previous prime is 79879927147. The next prime is 79879927177. The reversal of 79879927157 is 75172997897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77617402801 + 2262524356 = 278599^2 + 47566^2 .

It is a cyclic number.

It is not a de Polignac number, because 79879927157 - 2¹⁸ = 79879665013 is a prime.

It is a super-2 number, since 2×79879927157² (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 (79879927147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39939963578 + 39939963579.

It is an arithmetic number, because the mean of its divisors is an integer number (39939963579).

Almost surely, 2^79879927157 is an apocalyptic number.

It is an amenable number.

79879927157 is a deficient number, since it is larger than the sum of its proper divisors (1).

79879927157 is an equidigital number, since it uses as much as digits as its factorization.

79879927157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 140026320, while the sum is 71.

The spelling of 79879927157 in words is "seventy-nine billion, eight hundred seventy-nine million, nine hundred twenty-seven thousand, one hundred fifty-seven".