977540559957791 has 2 divisors, whose sum is σ = 977540559957792. Its totient is φ = 977540559957790.

The previous prime is 977540559957763. The next prime is 977540559957799. The reversal of 977540559957791 is 197759955045779.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 977540559957791 - 2¹⁸ = 977540559695647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 977540559957697 and 977540559957706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (977540559957799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488770279978895 + 488770279978896.

It is an arithmetic number, because the mean of its divisors is an integer number (488770279978896).

Almost surely, 2^{977540559957791} is an apocalyptic number.

977540559957791 is a deficient number, since it is larger than the sum of its proper divisors (1).

977540559957791 is an equidigital number, since it uses as much as digits as its factorization.

977540559957791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39382402500, while the sum is 89.

The spelling of 977540559957791 in words is "nine hundred seventy-seven trillion, five hundred forty billion, five hundred fifty-nine million, nine hundred fifty-seven thousand, seven hundred ninety-one".