725686651 has 4 divisors (see below), whose sum is σ = 727129872. Its totient is φ = 724243432.

The previous prime is 725686609. The next prime is 725686673. The reversal of 725686651 is 156686527.

725686651 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 an emirpimes, since its reverse is a distinct semiprime: 156686527 = 37 ⋅4234771.

It is a cyclic number.

It is not a de Polignac number, because 725686651 - 2⁷ = 725686523 is a prime.

It is a super-2 number, since 2×725686651² = 1053242230879191602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725686601) 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, 720856 + ... + 721861.

It is an arithmetic number, because the mean of its divisors is an integer number (181782468).

Almost surely, 2^725686651 is an apocalyptic number.

725686651 is a deficient number, since it is larger than the sum of its proper divisors (1443221).

725686651 is a wasteful number, since it uses less digits than its factorization.

725686651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443220.

The product of its digits is 604800, while the sum is 46.

The square root of 725686651 is about 26938.5718069834. The cubic root of 725686651 is about 898.6344109037.

The spelling of 725686651 in words is "seven hundred twenty-five million, six hundred eighty-six thousand, six hundred fifty-one".