660278130625 has 15 divisors (see below), whose sum is σ = 825108937653. Its totient is φ = 528206253000.

The previous prime is 660278130601. The next prime is 660278130637. The reversal of 660278130625 is 526031872066.

The square root of 660278130625 is 812575.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 51765805441 + 608512325184 = 227521^2 + 780072^2 .

It is not a de Polignac number, because 660278130625 - 2⁷ = 660278130497 is a prime.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 20298124 + ... + 20330626.

Almost surely, 2^660278130625 is an apocalyptic number.

660278130625 is the 812575-th square number.

660278130625 is the 406288-th centered octagonal number.

It is an amenable number.

660278130625 is a deficient number, since it is larger than the sum of its proper divisors (164830807028).

660278130625 is an frugal number, since it uses more digits than its factorization.

660278130625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65026 (or 32508 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 660278130625 in words is "six hundred sixty billion, two hundred seventy-eight million, one hundred thirty thousand, six hundred twenty-five".