79970881645121 has 2 divisors, whose sum is σ = 79970881645122. Its totient is φ = 79970881645120.

The previous prime is 79970881645117. The next prime is 79970881645141. The reversal of 79970881645121 is 12154618807997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79947560995600 + 23320649521 = 8941340^2 + 152711^2 .

It is a cyclic number.

It is not a de Polignac number, because 79970881645121 - 2² = 79970881645117 is a prime.

It is a super-2 number, since 2×79970881645121² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79970881645141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39985440822560 + 39985440822561.

It is an arithmetic number, because the mean of its divisors is an integer number (39985440822561).

Almost surely, 2^{79970881645121} is an apocalyptic number.

It is an amenable number.

79970881645121 is a deficient number, since it is larger than the sum of its proper divisors (1).

79970881645121 is an equidigital number, since it uses as much as digits as its factorization.

79970881645121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60963840, while the sum is 68.

The spelling of 79970881645121 in words is "seventy-nine trillion, nine hundred seventy billion, eight hundred eighty-one million, six hundred forty-five thousand, one hundred twenty-one".