2666600645 has 8 divisors (see below), whose sum is σ = 3235875480. Its totient is φ = 2109310720.

The previous prime is 2666600641. The next prime is 2666600659. The reversal of 2666600645 is 5460066662.

2666600645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 131377444 + 2535223201 = 11462^2 + 50351^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2666600645 - 2² = 2666600641 is a prime.

It is a super-2 number, since 2×2666600645² = 14221517999828832050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666600641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2995736 + ... + 2996625.

It is an arithmetic number, because the mean of its divisors is an integer number (404484435).

Almost surely, 2^2666600645 is an apocalyptic number.

It is an amenable number.

2666600645 is a deficient number, since it is larger than the sum of its proper divisors (569274835).

2666600645 is an equidigital number, since it uses as much as digits as its factorization.

2666600645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5992455.

The product of its (nonzero) digits is 311040, while the sum is 41.

The square root of 2666600645 is about 51639.1386934368. The cubic root of 2666600645 is about 1386.7111043901.

The spelling of 2666600645 in words is "two billion, six hundred sixty-six million, six hundred thousand, six hundred forty-five".