2115664465 has 16 divisors (see below), whose sum is σ = 2584724688. Its totient is φ = 1662114816.

The previous prime is 2115664387. The next prime is 2115664469. The reversal of 2115664465 is 5644665112.

It can be written as a sum of positive squares in 8 ways, for example, as 608904976 + 1506759489 = 24676^2 + 38817^2 .

It is a cyclic number.

It is not a de Polignac number, because 2115664465 - 2¹⁵ = 2115631697 is a prime.

It is a super-2 number, since 2×2115664465² = 8952072256927472450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2115664469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72607 + ... + 97483.

It is an arithmetic number, because the mean of its divisors is an integer number (161545293).

Almost surely, 2^2115664465 is an apocalyptic number.

It is an amenable number.

2115664465 is a deficient number, since it is larger than the sum of its proper divisors (469060223).

2115664465 is a wasteful number, since it uses less digits than its factorization.

2115664465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25188.

The product of its digits is 172800, while the sum is 40.

The square root of 2115664465 is about 45996.3527358420. The cubic root of 2115664465 is about 1283.7553422189.

The spelling of 2115664465 in words is "two billion, one hundred fifteen million, six hundred sixty-four thousand, four hundred sixty-five".