2115664009 has 2 divisors, whose sum is σ = 2115664010. Its totient is φ = 2115664008.

The previous prime is 2115663983. The next prime is 2115664013. The reversal of 2115664009 is 9004665112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1274490000 + 841174009 = 35700^2 + 29003^2 .

It is a cyclic number.

It is not a de Polignac number, because 2115664009 - 2²⁷ = 1981446281 is a prime.

It is not a weakly prime, because it can be changed into another prime (2115664609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1057832004 + 1057832005.

It is an arithmetic number, because the mean of its divisors is an integer number (1057832005).

Almost surely, 2^2115664009 is an apocalyptic number.

It is an amenable number.

2115664009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115664009 is an equidigital number, since it uses as much as digits as its factorization.

2115664009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 2115664009 is about 45996.3477789270. The cubic root of 2115664009 is about 1283.7552499875.

The spelling of 2115664009 in words is "two billion, one hundred fifteen million, six hundred sixty-four thousand, nine".