2666663977 has 2 divisors, whose sum is σ = 2666663978. Its totient is φ = 2666663976.

The previous prime is 2666663971. The next prime is 2666664019. The reversal of 2666663977 is 7793666662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1363381776 + 1303282201 = 36924^2 + 36101^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666663977 - 2²⁷ = 2532446249 is a prime.

It is a super-2 number, since 2×2666663977² = 14222193532458913058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2666663971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333331988 + 1333331989.

It is an arithmetic number, because the mean of its divisors is an integer number (1333331989).

Almost surely, 2^2666663977 is an apocalyptic number.

It is an amenable number.

2666663977 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666663977 is an equidigital number, since it uses as much as digits as its factorization.

2666663977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20575296, while the sum is 58.

The square root of 2666663977 is about 51639.7519068401. The cubic root of 2666663977 is about 1386.7220824734.

The spelling of 2666663977 in words is "two billion, six hundred sixty-six million, six hundred sixty-three thousand, nine hundred seventy-seven".