664560273 has 16 divisors (see below), whose sum is σ = 955033856. Its totient is φ = 408620160.

The previous prime is 664560263. The next prime is 664560341. The reversal of 664560273 is 372065466.

It is not a de Polignac number, because 664560273 - 2⁹ = 664559761 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664560263) 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, 45333 + ... + 58173.

It is an arithmetic number, because the mean of its divisors is an integer number (59689616).

Almost surely, 2^664560273 is an apocalyptic number.

It is an amenable number.

664560273 is a deficient number, since it is larger than the sum of its proper divisors (290473583).

664560273 is a wasteful number, since it uses less digits than its factorization.

664560273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14184.

The product of its (nonzero) digits is 181440, while the sum is 39.

The square root of 664560273 is about 25779.0665657234. The cubic root of 664560273 is about 872.6594418566.

The spelling of 664560273 in words is "six hundred sixty-four million, five hundred sixty thousand, two hundred seventy-three".