651631266 has 48 divisors (see below), whose sum is σ = 1658704320. Its totient is φ = 182273760.

The previous prime is 651631261. The next prime is 651631291. The reversal of 651631266 is 662136156.

651631266 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 651631266.

It is not an unprimeable number, because it can be changed into a prime (651631261) 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, 124006 + ... + 129153.

It is an arithmetic number, because the mean of its divisors is an integer number (34556340).

Almost surely, 2^651631266 is an apocalyptic number.

651631266 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

651631266 is an abundant number, since it is smaller than the sum of its proper divisors (1007073054).

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

651631266 is a wasteful number, since it uses less digits than its factorization.

651631266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253191 (or 253188 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 651631266 is about 25527.0692794923. The cubic root of 651631266 is about 866.9631494177.

The spelling of 651631266 in words is "six hundred fifty-one million, six hundred thirty-one thousand, two hundred sixty-six".