77077783361 has 2 divisors, whose sum is σ = 77077783362. Its totient is φ = 77077783360.

The previous prime is 77077783243. The next prime is 77077783397. The reversal of 77077783361 is 16338777077.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59222142736 + 17855640625 = 243356^2 + 133625^2 .

It is a cyclic number.

It is not a de Polignac number, because 77077783361 - 2²² = 77073589057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77077783297 and 77077783306.

It is not a weakly prime, because it can be changed into another prime (77007783361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38538891680 + 38538891681.

It is an arithmetic number, because the mean of its divisors is an integer number (38538891681).

Almost surely, 2^77077783361 is an apocalyptic number.

It is an amenable number.

77077783361 is a deficient number, since it is larger than the sum of its proper divisors (1).

77077783361 is an equidigital number, since it uses as much as digits as its factorization.

77077783361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7260624, while the sum is 56.

The spelling of 77077783361 in words is "seventy-seven billion, seventy-seven million, seven hundred eighty-three thousand, three hundred sixty-one".