651016665 has 96 divisors (see below), whose sum is σ = 1314593280. Its totient is φ = 295239168.

The previous prime is 651016607. The next prime is 651016673. The reversal of 651016665 is 566610156.

It is not a de Polignac number, because 651016665 - 2¹⁰ = 651015641 is a prime.

Together with 663576615 it forms an amicable pair .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 410464 + ... + 412046.

It is an arithmetic number, because the mean of its divisors is an integer number (13693680).

Almost surely, 2^651016665 is an apocalyptic number.

651016665 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

651016665 is an abundant number, since it is smaller than the sum of its proper divisors (663576615).

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

651016665 is a wasteful number, since it uses less digits than its factorization.

651016665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663 (or 1660 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 651016665 is about 25515.0282186793. The cubic root of 651016665 is about 866.6904982763.

The spelling of 651016665 in words is "six hundred fifty-one million, sixteen thousand, six hundred sixty-five".