665147893 has 2 divisors, whose sum is σ = 665147894. Its totient is φ = 665147892.

The previous prime is 665147881. The next prime is 665147911. The reversal of 665147893 is 398741566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 563682564 + 101465329 = 23742^2 + 10073^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665147893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665147803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332573946 + 332573947.

It is an arithmetic number, because the mean of its divisors is an integer number (332573947).

Almost surely, 2^665147893 is an apocalyptic number.

It is an amenable number.

665147893 is a deficient number, since it is larger than the sum of its proper divisors (1).

665147893 is an equidigital number, since it uses as much as digits as its factorization.

665147893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 49.

The square root of 665147893 is about 25790.4612793180. The cubic root of 665147893 is about 872.9165748287.

The spelling of 665147893 in words is "six hundred sixty-five million, one hundred forty-seven thousand, eight hundred ninety-three".