646000651 has 4 divisors (see below), whose sum is σ = 646074400. Its totient is φ = 645926904.

The previous prime is 646000639. The next prime is 646000657. The reversal of 646000651 is 156000646.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 646000651 - 2¹¹ = 645998603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646000657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21636 + ... + 41953.

It is an arithmetic number, because the mean of its divisors is an integer number (161518600).

Almost surely, 2^646000651 is an apocalyptic number.

646000651 is a deficient number, since it is larger than the sum of its proper divisors (73749).

646000651 is a wasteful number, since it uses less digits than its factorization.

646000651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73748.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 646000651 is about 25416.5428609007. The cubic root of 646000651 is about 864.4588375578.

The spelling of 646000651 in words is "six hundred forty-six million, six hundred fifty-one", and thus it is an aban number.