2116646662649 has 2 divisors, whose sum is σ = 2116646662650. Its totient is φ = 2116646662648.

The previous prime is 2116646662547. The next prime is 2116646662661. The reversal of 2116646662649 is 9462666466112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1308278440000 + 808368222649 = 1143800^2 + 899093^2 .

It is a cyclic number.

It is not a de Polignac number, because 2116646662649 - 2³² = 2112351695353 is a prime.

It is a super-2 number, since 2×2116646662649² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2116646665649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058323331324 + 1058323331325.

It is an arithmetic number, because the mean of its divisors is an integer number (1058323331325).

Almost surely, 2^{2116646662649} is an apocalyptic number.

It is an amenable number.

2116646662649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2116646662649 is an equidigital number, since it uses as much as digits as its factorization.

2116646662649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26873856, while the sum is 59.

The spelling of 2116646662649 in words is "two trillion, one hundred sixteen billion, six hundred forty-six million, six hundred sixty-two thousand, six hundred forty-nine".