666309051 has 16 divisors (see below), whose sum is σ = 987522720. Its totient is φ = 444026880.

The previous prime is 666309047. The next prime is 666309073. The reversal of 666309051 is 150903666.

It is not a de Polignac number, because 666309051 - 2² = 666309047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666308997 and 666309015.

It is not an unprimeable number, because it can be changed into a prime (666309001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123531 + ... + 128811.

It is an arithmetic number, because the mean of its divisors is an integer number (61720170).

Almost surely, 2^666309051 is an apocalyptic number.

666309051 is a deficient number, since it is larger than the sum of its proper divisors (321213669).

666309051 is a wasteful number, since it uses less digits than its factorization.

666309051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9963 (or 9957 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 666309051 is about 25812.9628481505. The cubic root of 666309051 is about 873.4242337675.

The spelling of 666309051 in words is "six hundred sixty-six million, three hundred nine thousand, fifty-one".