666907051 has 2 divisors, whose sum is σ = 666907052. Its totient is φ = 666907050.

The previous prime is 666907037. The next prime is 666907063. The reversal of 666907051 is 150709666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666907051 - 2²⁵ = 633352619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666906995 and 666907013.

It is not a weakly prime, because it can be changed into another prime (666907001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333453525 + 333453526.

It is an arithmetic number, because the mean of its divisors is an integer number (333453526).

Almost surely, 2^666907051 is an apocalyptic number.

666907051 is a deficient number, since it is larger than the sum of its proper divisors (1).

666907051 is an equidigital number, since it uses as much as digits as its factorization.

666907051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 666907051 is about 25824.5435777673. The cubic root of 666907051 is about 873.6854496478.

The spelling of 666907051 in words is "six hundred sixty-six million, nine hundred seven thousand, fifty-one".