666266645 has 64 divisors (see below), whose sum is σ = 945561600. Its totient is φ = 445885440.

The previous prime is 666266609. The next prime is 666266651. The reversal of 666266645 is 546662666.

It is not a de Polignac number, because 666266645 - 2⁸ = 666266389 is a prime.

It is a super-2 number, since 2×666266645² = 887822484479112050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 666266645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5896109 + ... + 5896221.

It is an arithmetic number, because the mean of its divisors is an integer number (14774400).

Almost surely, 2^666266645 is an apocalyptic number.

It is an amenable number.

666266645 is a deficient number, since it is larger than the sum of its proper divisors (279294955).

666266645 is a wasteful number, since it uses less digits than its factorization.

666266645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290.

The product of its digits is 1866240, while the sum is 47.

The square root of 666266645 is about 25812.1414260809. The cubic root of 666266645 is about 873.4057042209.

The spelling of 666266645 in words is "six hundred sixty-six million, two hundred sixty-six thousand, six hundred forty-five".