651665020 has 24 divisors (see below), whose sum is σ = 1371304368. Its totient is φ = 260131200.

The previous prime is 651665009. The next prime is 651665033. The reversal of 651665020 is 20566156.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23361 + ... + 43000.

It is an arithmetic number, because the mean of its divisors is an integer number (57137682).

Almost surely, 2^651665020 is an apocalyptic number.

It is an amenable number.

651665020 is an abundant number, since it is smaller than the sum of its proper divisors (719639348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

651665020 is a wasteful number, since it uses less digits than its factorization.

651665020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66861 (or 66859 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 651665020 is about 25527.7304122399. The cubic root of 651665020 is about 866.9781185014.

The spelling of 651665020 in words is "six hundred fifty-one million, six hundred sixty-five thousand, twenty".