651665651 has 24 divisors (see below), whose sum is σ = 828611280. Its totient is φ = 507874752.

The previous prime is 651665633. The next prime is 651665659. The reversal of 651665651 is 156566156.

It is not a de Polignac number, because 651665651 - 2¹⁸ = 651403507 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 651665599 and 651665608.

It is not an unprimeable number, because it can be changed into a prime (651665659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35045 + ... + 50313.

It is an arithmetic number, because the mean of its divisors is an integer number (34525470).

Almost surely, 2^651665651 is an apocalyptic number.

651665651 is a deficient number, since it is larger than the sum of its proper divisors (176945629).

651665651 is a wasteful number, since it uses less digits than its factorization.

651665651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15363 (or 15356 counting only the distinct ones).

The product of its digits is 162000, while the sum is 41.

The square root of 651665651 is about 25527.7427713458. The cubic root of 651665651 is about 866.9783983298.

The spelling of 651665651 in words is "six hundred fifty-one million, six hundred sixty-five thousand, six hundred fifty-one".