655621525 has 24 divisors (see below), whose sum is σ = 878492384. Its totient is φ = 482500800.

The previous prime is 655621523. The next prime is 655621567. The reversal of 655621525 is 525126556.

It is not a de Polignac number, because 655621525 - 2¹ = 655621523 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655621523) 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, 96490 + ... + 103060.

Almost surely, 2^655621525 is an apocalyptic number.

655621525 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

655621525 is a deficient number, since it is larger than the sum of its proper divisors (222870859).

655621525 is a wasteful number, since it uses less digits than its factorization.

655621525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6901 (or 6896 counting only the distinct ones).

The product of its digits is 90000, while the sum is 37.

The square root of 655621525 is about 25605.1074006730. The cubic root of 655621525 is about 868.7291636222.

The spelling of 655621525 in words is "six hundred fifty-five million, six hundred twenty-one thousand, five hundred twenty-five".