651664252 has 12 divisors (see below), whose sum is σ = 1140678000. Its totient is φ = 325756256.

The previous prime is 651664243. The next prime is 651664271. The reversal of 651664252 is 252466156.

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 3 ways as a sum of consecutive naturals, for example, 3249 + ... + 36247.

It is an arithmetic number, because the mean of its divisors is an integer number (95056500).

Almost surely, 2^651664252 is an apocalyptic number.

It is an amenable number.

651664252 is a deficient number, since it is larger than the sum of its proper divisors (489013748).

651664252 is a wasteful number, since it uses less digits than its factorization.

651664252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37940 (or 37938 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 651664252 is about 25527.7153697702. The cubic root of 651664252 is about 866.9777779177.

The spelling of 651664252 in words is "six hundred fifty-one million, six hundred sixty-four thousand, two hundred fifty-two".