2615664666 has 32 divisors (see below), whose sum is σ = 5275670400. Its totient is φ = 864527040.

The previous prime is 2615664661. The next prime is 2615664671. The reversal of 2615664666 is 6664665162.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2615664661) and next prime (2615664671).

It is not an unprimeable number, because it can be changed into a prime (2615664661) 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, 386520 + ... + 393228.

It is an arithmetic number, because the mean of its divisors is an integer number (164864700).

Almost surely, 2^2615664666 is an apocalyptic number.

2615664666 is an abundant number, since it is smaller than the sum of its proper divisors (2660005734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2615664666 is a wasteful number, since it uses less digits than its factorization.

2615664666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7254.

The product of its digits is 1866240, while the sum is 48.

The square root of 2615664666 is about 51143.5691558577. The cubic root of 2615664666 is about 1377.8248773532.

The spelling of 2615664666 in words is "two billion, six hundred fifteen million, six hundred sixty-four thousand, six hundred sixty-six".