79957404889 has 2 divisors, whose sum is σ = 79957404890. Its totient is φ = 79957404888.

The previous prime is 79957404883. The next prime is 79957404929. The reversal of 79957404889 is 98840475997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74383289289 + 5574115600 = 272733^2 + 74660^2 .

It is a cyclic number.

It is not a de Polignac number, because 79957404889 - 2¹¹ = 79957402841 is a prime.

It is a super-2 number, since 2×79957404889² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79957404883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39978702444 + 39978702445.

It is an arithmetic number, because the mean of its divisors is an integer number (39978702445).

Almost surely, 2^79957404889 is an apocalyptic number.

It is an amenable number.

79957404889 is a deficient number, since it is larger than the sum of its proper divisors (1).

79957404889 is an equidigital number, since it uses as much as digits as its factorization.

79957404889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 182891520, while the sum is 70.

The spelling of 79957404889 in words is "seventy-nine billion, nine hundred fifty-seven million, four hundred four thousand, eight hundred eighty-nine".