77516112121969 has 2 divisors, whose sum is σ = 77516112121970. Its totient is φ = 77516112121968.

The previous prime is 77516112121963. The next prime is 77516112122021. The reversal of 77516112121969 is 96912121161577.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72397771481344 + 5118340640625 = 8508688^2 + 2262375^2 .

It is a cyclic number.

It is not a de Polignac number, because 77516112121969 - 2¹¹ = 77516112119921 is a prime.

It is a super-2 number, since 2×77516112121969² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77516112121963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38758056060984 + 38758056060985.

It is an arithmetic number, because the mean of its divisors is an integer number (38758056060985).

Almost surely, 2^{77516112121969} is an apocalyptic number.

It is an amenable number.

77516112121969 is a deficient number, since it is larger than the sum of its proper divisors (1).

77516112121969 is an equidigital number, since it uses as much as digits as its factorization.

77516112121969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2857680, while the sum is 58.

The spelling of 77516112121969 in words is "seventy-seven trillion, five hundred sixteen billion, one hundred twelve million, one hundred twenty-one thousand, nine hundred sixty-nine".