77880993769 has 2 divisors, whose sum is σ = 77880993770. Its totient is φ = 77880993768.

The previous prime is 77880993767. The next prime is 77880993823. The reversal of 77880993769 is 96739908877.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45363888144 + 32517105625 = 212988^2 + 180325^2 .

It is a cyclic number.

It is not a de Polignac number, because 77880993769 - 2¹ = 77880993767 is a prime.

It is a super-2 number, since 2×77880993769² (a number of 23 digits) contains 22 as substring.

Together with 77880993767, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77880993767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38940496884 + 38940496885.

It is an arithmetic number, because the mean of its divisors is an integer number (38940496885).

Almost surely, 2^77880993769 is an apocalyptic number.

It is an amenable number.

77880993769 is a deficient number, since it is larger than the sum of its proper divisors (1).

77880993769 is an equidigital number, since it uses as much as digits as its factorization.

77880993769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288054144, while the sum is 73.

The spelling of 77880993769 in words is "seventy-seven billion, eight hundred eighty million, nine hundred ninety-three thousand, seven hundred sixty-nine".