2664622666 has 4 divisors (see below), whose sum is σ = 3996934002. Its totient is φ = 1332311332.

The previous prime is 2664622663. The next prime is 2664622739. The reversal of 2664622666 is 6662264662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2590301025 + 74321641 = 50895^2 + 8621^2 .

It is not an unprimeable number, because it can be changed into a prime (2664622663) 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 as a sum of consecutive naturals, namely, 666155665 + ... + 666155668.

Almost surely, 2^2664622666 is an apocalyptic number.

2664622666 is a deficient number, since it is larger than the sum of its proper divisors (1332311336).

2664622666 is a wasteful number, since it uses less digits than its factorization.

2664622666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332311335.

The product of its digits is 1492992, while the sum is 46.

The square root of 2664622666 is about 51619.9832041817. The cubic root of 2664622666 is about 1386.3681504103.

The spelling of 2664622666 in words is "two billion, six hundred sixty-four million, six hundred twenty-two thousand, six hundred sixty-six".