2116509977 has 2 divisors, whose sum is σ = 2116509978. Its totient is φ = 2116509976.

The previous prime is 2116509949. The next prime is 2116510021. The reversal of 2116509977 is 7799056112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1762656256 + 353853721 = 41984^2 + 18811^2 .

It is a cyclic number.

It is not a de Polignac number, because 2116509977 - 2⁸ = 2116509721 is a prime.

It is a super-2 number, since 2×2116509977² = 8959228965481081058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2116509907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058254988 + 1058254989.

It is an arithmetic number, because the mean of its divisors is an integer number (1058254989).

Almost surely, 2^2116509977 is an apocalyptic number.

It is an amenable number.

2116509977 is a deficient number, since it is larger than the sum of its proper divisors (1).

2116509977 is an equidigital number, since it uses as much as digits as its factorization.

2116509977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 238140, while the sum is 47.

The square root of 2116509977 is about 46005.5428943079. The cubic root of 2116509977 is about 1283.9263343590.

The spelling of 2116509977 in words is "two billion, one hundred sixteen million, five hundred nine thousand, nine hundred seventy-seven".