79581257744369 has 2 divisors, whose sum is σ = 79581257744370. Its totient is φ = 79581257744368.

The previous prime is 79581257744363. The next prime is 79581257744413. The reversal of 79581257744369 is 96344775218597.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78292324407025 + 1288933337344 = 8848295^2 + 1135312^2 .

It is a cyclic number.

It is not a de Polignac number, because 79581257744369 - 2¹⁶ = 79581257678833 is a prime.

It is a super-3 number, since 3×79581257744369³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 79581257744369.

It is not a weakly prime, because it can be changed into another prime (79581257744363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39790628872184 + 39790628872185.

It is an arithmetic number, because the mean of its divisors is an integer number (39790628872185).

Almost surely, 2^{79581257744369} is an apocalyptic number.

It is an amenable number.

79581257744369 is a deficient number, since it is larger than the sum of its proper divisors (1).

79581257744369 is an equidigital number, since it uses as much as digits as its factorization.

79581257744369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3200601600, while the sum is 77.

The spelling of 79581257744369 in words is "seventy-nine trillion, five hundred eighty-one billion, two hundred fifty-seven million, seven hundred forty-four thousand, three hundred sixty-nine".