664151860 has 24 divisors (see below), whose sum is σ = 1395252936. Its totient is φ = 265559040.

The previous prime is 664151857. The next prime is 664151867. The reversal of 664151860 is 68151466.

664151860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 104734756 + 559417104 = 10234^2 + 23652^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664151867) 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, 68940 + ... + 77980.

It is an arithmetic number, because the mean of its divisors is an integer number (58135539).

Almost surely, 2^664151860 is an apocalyptic number.

It is an amenable number.

664151860 is an abundant number, since it is smaller than the sum of its proper divisors (731101076).

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

664151860 is a wasteful number, since it uses less digits than its factorization.

664151860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12723 (or 12721 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 664151860 is about 25771.1439404618. The cubic root of 664151860 is about 872.4806376603.

The spelling of 664151860 in words is "six hundred sixty-four million, one hundred fifty-one thousand, eight hundred sixty".