8516961977 has 2 divisors, whose sum is σ = 8516961978. Its totient is φ = 8516961976.

The previous prime is 8516961967. The next prime is 8516961997. The reversal of 8516961977 is 7791696158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6149069056 + 2367892921 = 78416^2 + 48661^2 .

It is a cyclic number.

It is not a de Polignac number, because 8516961977 - 2¹² = 8516957881 is a prime.

It is not a weakly prime, because it can be changed into another prime (8516961967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4258480988 + 4258480989.

It is an arithmetic number, because the mean of its divisors is an integer number (4258480989).

Almost surely, 2^8516961977 is an apocalyptic number.

It is an amenable number.

8516961977 is a deficient number, since it is larger than the sum of its proper divisors (1).

8516961977 is an equidigital number, since it uses as much as digits as its factorization.

8516961977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 59.

The square root of 8516961977 is about 92287.3879628197. The cubic root of 8516961977 is about 2042.1841576035.

The spelling of 8516961977 in words is "eight billion, five hundred sixteen million, nine hundred sixty-one thousand, nine hundred seventy-seven".