77807967049 has 2 divisors, whose sum is σ = 77807967050. Its totient is φ = 77807967048.

The previous prime is 77807967043. The next prime is 77807967089. The reversal of 77807967049 is 94076970877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53749785600 + 24058181449 = 231840^2 + 155107^2 .

It is an emirp because it is prime and its reverse (94076970877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77807967049 - 2²⁹ = 77271096137 is a prime.

It is not a weakly prime, because it can be changed into another prime (77807967043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38903983524 + 38903983525.

It is an arithmetic number, because the mean of its divisors is an integer number (38903983525).

Almost surely, 2^77807967049 is an apocalyptic number.

It is an amenable number.

77807967049 is a deficient number, since it is larger than the sum of its proper divisors (1).

77807967049 is an equidigital number, since it uses as much as digits as its factorization.

77807967049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37340352, while the sum is 64.

The spelling of 77807967049 in words is "seventy-seven billion, eight hundred seven million, nine hundred sixty-seven thousand, forty-nine".