7122865725 has 18 divisors (see below), whose sum is σ = 12757844346. Its totient is φ = 3798861600.

The previous prime is 7122865709. The next prime is 7122865759. The reversal of 7122865725 is 5275682217.

7122865725 is a `hidden beast` number, since 71 + 2 + 2 + 8 + 6 + 572 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 167806116 + 6955059609 = 12954^2 + 83397^2 .

It is not a de Polignac number, because 7122865725 - 2⁴ = 7122865709 is a prime.

It is a super-2 number, since 2×7122865725² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 15828366 + ... + 15828815.

Almost surely, 2^7122865725 is an apocalyptic number.

7122865725 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

7122865725 is a deficient number, since it is larger than the sum of its proper divisors (5634978621).

7122865725 is a wasteful number, since it uses less digits than its factorization.

7122865725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31657197 (or 31657189 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 7122865725 is about 84397.0717797721. The cubic root of 7122865725 is about 1924.0584117197.

The spelling of 7122865725 in words is "seven billion, one hundred twenty-two million, eight hundred sixty-five thousand, seven hundred twenty-five".