77251613687669 has 2 divisors, whose sum is σ = 77251613687670. Its totient is φ = 77251613687668.

The previous prime is 77251613687657. The next prime is 77251613687693. The reversal of 77251613687669 is 96678631615277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77182989598225 + 68624089444 = 8785385^2 + 261962^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77251613687669 is a prime.

It is a super-2 number, since 2×77251613687669² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 77251613687596 and 77251613687605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77251613687069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38625806843834 + 38625806843835.

It is an arithmetic number, because the mean of its divisors is an integer number (38625806843835).

Almost surely, 2^{77251613687669} is an apocalyptic number.

It is an amenable number.

77251613687669 is a deficient number, since it is larger than the sum of its proper divisors (1).

77251613687669 is an equidigital number, since it uses as much as digits as its factorization.

77251613687669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960180480, while the sum is 74.

The spelling of 77251613687669 in words is "seventy-seven trillion, two hundred fifty-one billion, six hundred thirteen million, six hundred eighty-seven thousand, six hundred sixty-nine".