665046947 has 2 divisors, whose sum is σ = 665046948. Its totient is φ = 665046946.

The previous prime is 665046883. The next prime is 665046973. The reversal of 665046947 is 749640566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665046947 - 2⁶ = 665046883 is a prime.

It is not a weakly prime, because it can be changed into another prime (665042947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332523473 + 332523474.

It is an arithmetic number, because the mean of its divisors is an integer number (332523474).

Almost surely, 2^665046947 is an apocalyptic number.

665046947 is a deficient number, since it is larger than the sum of its proper divisors (1).

665046947 is an equidigital number, since it uses as much as digits as its factorization.

665046947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The square root of 665046947 is about 25788.5041636773. The cubic root of 665046947 is about 872.8724132743.

The spelling of 665046947 in words is "six hundred sixty-five million, forty-six thousand, nine hundred forty-seven".