725120894657 has 4 divisors (see below), whose sum is σ = 725138209236. Its totient is φ = 725103580080.

The previous prime is 725120894623. The next prime is 725120894669. The reversal of 725120894657 is 756498021527.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103926285376 + 621194609281 = 322376^2 + 788159^2 .

It is a cyclic number.

It is not a de Polignac number, because 725120894657 - 2¹⁰ = 725120893633 is a prime.

It is a super-2 number, since 2×725120894657² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725120894257) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 8594318 + ... + 8678279.

It is an arithmetic number, because the mean of its divisors is an integer number (181284552309).

Almost surely, 2^725120894657 is an apocalyptic number.

It is an amenable number.

725120894657 is a deficient number, since it is larger than the sum of its proper divisors (17314579).

725120894657 is a wasteful number, since it uses less digits than its factorization.

725120894657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17314578.

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 725120894657 in words is "seven hundred twenty-five billion, one hundred twenty million, eight hundred ninety-four thousand, six hundred fifty-seven".