651665525 has 48 divisors (see below), whose sum is σ = 968985600. Its totient is φ = 425295360.

The previous prime is 651665507. The next prime is 651665533. The reversal of 651665525 is 525566156.

It is not a de Polignac number, because 651665525 - 2⁶ = 651665461 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 369596 + ... + 371354.

It is an arithmetic number, because the mean of its divisors is an integer number (20187200).

Almost surely, 2^651665525 is an apocalyptic number.

It is an amenable number.

651665525 is a deficient number, since it is larger than the sum of its proper divisors (317320075).

651665525 is a wasteful number, since it uses less digits than its factorization.

651665525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878 (or 1873 counting only the distinct ones).

The product of its digits is 270000, while the sum is 41.

The square root of 651665525 is about 25527.7403034424. The cubic root of 651665525 is about 866.9783424528.

The spelling of 651665525 in words is "six hundred fifty-one million, six hundred sixty-five thousand, five hundred twenty-five".