77166546991 has 2 divisors, whose sum is σ = 77166546992. Its totient is φ = 77166546990.

The previous prime is 77166546983. The next prime is 77166546997. The reversal of 77166546991 is 19964566177.

It is a strong prime.

It is an emirp because it is prime and its reverse (19964566177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77166546991 - 2³ = 77166546983 is a prime.

It is a super-2 number, since 2×77166546991² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77166546997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38583273495 + 38583273496.

It is an arithmetic number, because the mean of its divisors is an integer number (38583273496).

Almost surely, 2^77166546991 is an apocalyptic number.

77166546991 is a deficient number, since it is larger than the sum of its proper divisors (1).

77166546991 is an equidigital number, since it uses as much as digits as its factorization.

77166546991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17146080, while the sum is 61.

The spelling of 77166546991 in words is "seventy-seven billion, one hundred sixty-six million, five hundred forty-six thousand, nine hundred ninety-one".