666264813 has 8 divisors (see below), whose sum is σ = 889428000. Its totient is φ = 443639088.

The previous prime is 666264791. The next prime is 666264827. The reversal of 666264813 is 318462666.

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

It is not a de Polignac number, because 666264813 - 2¹⁰ = 666263789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666284813) 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, 131463 + ... + 136436.

It is an arithmetic number, because the mean of its divisors is an integer number (111178500).

Almost surely, 2^666264813 is an apocalyptic number.

It is an amenable number.

666264813 is a deficient number, since it is larger than the sum of its proper divisors (223163187).

666264813 is a wasteful number, since it uses less digits than its factorization.

666264813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268731.

The product of its digits is 248832, while the sum is 42.

The square root of 666264813 is about 25812.1059388807. The cubic root of 666264813 is about 873.4049037002.

The spelling of 666264813 in words is "six hundred sixty-six million, two hundred sixty-four thousand, eight hundred thirteen".