651022666 has 32 divisors (see below), whose sum is σ = 1145738880. Its totient is φ = 271627776.

The previous prime is 651022639. The next prime is 651022681. The reversal of 651022666 is 666220156.

651022666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201270 + ... + 204478.

It is an arithmetic number, because the mean of its divisors is an integer number (35804340).

Almost surely, 2^651022666 is an apocalyptic number.

651022666 is a deficient number, since it is larger than the sum of its proper divisors (494716214).

651022666 is a wasteful number, since it uses less digits than its factorization.

651022666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3598.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 651022666 is about 25515.1458157699. The cubic root of 651022666 is about 866.6931612873.

The spelling of 651022666 in words is "six hundred fifty-one million, twenty-two thousand, six hundred sixty-six".