664263654 has 16 divisors (see below), whose sum is σ = 1351045440. Its totient is φ = 217668200.

The previous prime is 664263653. The next prime is 664263671. The reversal of 664263654 is 456362466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664263653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 937872 + ... + 938579.

It is an arithmetic number, because the mean of its divisors is an integer number (84440340).

Almost surely, 2^664263654 is an apocalyptic number.

664263654 is an abundant number, since it is smaller than the sum of its proper divisors (686781786).

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

664263654 is a wasteful number, since it uses less digits than its factorization.

664263654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876515.

The product of its digits is 622080, while the sum is 42.

The square root of 664263654 is about 25773.3128254790. The cubic root of 664263654 is about 872.5295886277.

The spelling of 664263654 in words is "six hundred sixty-four million, two hundred sixty-three thousand, six hundred fifty-four".