665164254 has 32 divisors (see below), whose sum is σ = 1338884640. Its totient is φ = 220301312.

The previous prime is 665164231. The next prime is 665164259. The reversal of 665164254 is 452461566.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665164259) 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, 1077754 + ... + 1078370.

It is an arithmetic number, because the mean of its divisors is an integer number (41840145).

Almost surely, 2^665164254 is an apocalyptic number.

665164254 is an abundant number, since it is smaller than the sum of its proper divisors (673720386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665164254 is a wasteful number, since it uses less digits than its factorization.

665164254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484.

The product of its digits is 172800, while the sum is 39.

The square root of 665164254 is about 25790.7784682820. The cubic root of 665164254 is about 872.9237319694.

The spelling of 665164254 in words is "six hundred sixty-five million, one hundred sixty-four thousand, two hundred fifty-four".