1656612725 has 12 divisors (see below), whose sum is σ = 2082341796. Its totient is φ = 1307134080.

The previous prime is 1656612701. The next prime is 1656612731. The reversal of 1656612725 is 5272166561.

It can be written as a sum of positive squares in 6 ways, for example, as 19439281 + 1637173444 = 4409^2 + 40462^2 .

It is not a de Polignac number, because 1656612725 - 2⁸ = 1656612469 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 452042 + ... + 455691.

It is an arithmetic number, because the mean of its divisors is an integer number (173528483).

Almost surely, 2^1656612725 is an apocalyptic number.

It is an amenable number.

1656612725 is a deficient number, since it is larger than the sum of its proper divisors (425729071).

1656612725 is an equidigital number, since it uses as much as digits as its factorization.

1656612725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907816 (or 907811 counting only the distinct ones).

The product of its digits is 151200, while the sum is 41.

The square root of 1656612725 is about 40701.5076502087. The cubic root of 1656612725 is about 1183.2422383533.

The spelling of 1656612725 in words is "one billion, six hundred fifty-six million, six hundred twelve thousand, seven hundred twenty-five".