77959405220369 has 2 divisors, whose sum is σ = 77959405220370. Its totient is φ = 77959405220368.

The previous prime is 77959405220363. The next prime is 77959405220381. The reversal of 77959405220369 is 96302250495977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77253112890625 + 706292329744 = 8789375^2 + 840412^2 .

It is a cyclic number.

It is not a de Polignac number, because 77959405220369 - 2⁴ = 77959405220353 is a prime.

It is a super-2 number, since 2×77959405220369² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77959405220299 and 77959405220308.

It is not a weakly prime, because it can be changed into another prime (77959405220363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38979702610184 + 38979702610185.

It is an arithmetic number, because the mean of its divisors is an integer number (38979702610185).

Almost surely, 2^{77959405220369} is an apocalyptic number.

It is an amenable number.

77959405220369 is a deficient number, since it is larger than the sum of its proper divisors (1).

77959405220369 is an equidigital number, since it uses as much as digits as its factorization.

77959405220369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 257191200, while the sum is 68.

The spelling of 77959405220369 in words is "seventy-seven trillion, nine hundred fifty-nine billion, four hundred five million, two hundred twenty thousand, three hundred sixty-nine".