725164637 has 4 divisors (see below), whose sum is σ = 725302656. Its totient is φ = 725026620.

The previous prime is 725164607. The next prime is 725164639. The reversal of 725164637 is 736461527.

725164637 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 736461527 = 19 ⋅38761133.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-725164637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 725164594 and 725164603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725164639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60803 + ... + 71744.

It is an arithmetic number, because the mean of its divisors is an integer number (181325664).

Almost surely, 2^725164637 is an apocalyptic number.

It is an amenable number.

725164637 is a deficient number, since it is larger than the sum of its proper divisors (138019).

725164637 is a wasteful number, since it uses less digits than its factorization.

725164637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138018.

The product of its digits is 211680, while the sum is 41.

The square root of 725164637 is about 26928.8810944681. The cubic root of 725164637 is about 898.4188852503.

The spelling of 725164637 in words is "seven hundred twenty-five million, one hundred sixty-four thousand, six hundred thirty-seven".