8151561725 has 6 divisors (see below), whose sum is σ = 10107936570. Its totient is φ = 6521249360.

The previous prime is 8151561707. The next prime is 8151561791. The reversal of 8151561725 is 5271651518.

It can be written as a sum of positive squares in 3 ways, for example, as 842508676 + 7309053049 = 29026^2 + 85493^2 .

It is not a de Polignac number, because 8151561725 - 2⁶ = 8151561661 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 163031210 + ... + 163031259.

It is an arithmetic number, because the mean of its divisors is an integer number (1684656095).

Almost surely, 2^8151561725 is an apocalyptic number.

It is an amenable number.

8151561725 is a deficient number, since it is larger than the sum of its proper divisors (1956374845).

8151561725 is a wasteful number, since it uses less digits than its factorization.

8151561725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326062479 (or 326062474 counting only the distinct ones).

The product of its digits is 84000, while the sum is 41.

The square root of 8151561725 is about 90285.9996068050. Note that the first 3 decimals coincide. The cubic root of 8151561725 is about 2012.5512125131.

The spelling of 8151561725 in words is "eight billion, one hundred fifty-one million, five hundred sixty-one thousand, seven hundred twenty-five".