725641553 has 24 divisors (see below), whose sum is σ = 903627648. Its totient is φ = 570540672.

The previous prime is 725641541. The next prime is 725641589. The reversal of 725641553 is 355146527.

It is a happy number.

It is not a de Polignac number, because 725641553 - 2¹² = 725637457 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725641853) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 195725 + ... + 199397.

It is an arithmetic number, because the mean of its divisors is an integer number (37651152).

Almost surely, 2^725641553 is an apocalyptic number.

It is an amenable number.

725641553 is a deficient number, since it is larger than the sum of its proper divisors (177986095).

725641553 is a wasteful number, since it uses less digits than its factorization.

725641553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3873 (or 3860 counting only the distinct ones).

The product of its digits is 126000, while the sum is 38.

The square root of 725641553 is about 26937.7347414366. The cubic root of 725641553 is about 898.6157952224.

The spelling of 725641553 in words is "seven hundred twenty-five million, six hundred forty-one thousand, five hundred fifty-three".