77516112121919 has 2 divisors, whose sum is σ = 77516112121920. Its totient is φ = 77516112121918.

The previous prime is 77516112121907. The next prime is 77516112121949. The reversal of 77516112121919 is 91912121161577.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77516112121919 - 2¹² = 77516112117823 is a prime.

It is a super-2 number, since 2×77516112121919² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77516112121949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38758056060959 + 38758056060960.

It is an arithmetic number, because the mean of its divisors is an integer number (38758056060960).

Almost surely, 2^{77516112121919} is an apocalyptic number.

77516112121919 is a deficient number, since it is larger than the sum of its proper divisors (1).

77516112121919 is an equidigital number, since it uses as much as digits as its factorization.

77516112121919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 53.

The spelling of 77516112121919 in words is "seventy-seven trillion, five hundred sixteen billion, one hundred twelve million, one hundred twenty-one thousand, nine hundred nineteen".