9777664531 has 2 divisors, whose sum is σ = 9777664532. Its totient is φ = 9777664530.

The previous prime is 9777664483. The next prime is 9777664571. The reversal of 9777664531 is 1354667779.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9777664531 - 2²¹ = 9775567379 is a prime.

It is a super-2 number, since 2×9777664531² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9777664571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4888832265 + 4888832266.

It is an arithmetic number, because the mean of its divisors is an integer number (4888832266).

Almost surely, 2^9777664531 is an apocalyptic number.

9777664531 is a deficient number, since it is larger than the sum of its proper divisors (1).

9777664531 is an equidigital number, since it uses as much as digits as its factorization.

9777664531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6667920, while the sum is 55.

The square root of 9777664531 is about 98882.0738607357. The cubic root of 9777664531 is about 2138.3479644443.

The spelling of 9777664531 in words is "nine billion, seven hundred seventy-seven million, six hundred sixty-four thousand, five hundred thirty-one".