664055590 has 16 divisors (see below), whose sum is σ = 1303963920. Its totient is φ = 241474720.

The previous prime is 664055573. The next prime is 664055617. The reversal of 664055590 is 95550466.

664055590 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×664055590² = 881939653220496200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3018325 + ... + 3018544.

It is an arithmetic number, because the mean of its divisors is an integer number (81497745).

Almost surely, 2^664055590 is an apocalyptic number.

664055590 is a deficient number, since it is larger than the sum of its proper divisors (639908330).

664055590 is a wasteful number, since it uses less digits than its factorization.

664055590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6036887.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 664055590 is about 25769.2760860681. The cubic root of 664055590 is about 872.4384797470.

The spelling of 664055590 in words is "six hundred sixty-four million, fifty-five thousand, five hundred ninety".