646575575651 has 2 divisors, whose sum is σ = 646575575652. Its totient is φ = 646575575650.

The previous prime is 646575575641. The next prime is 646575575677. The reversal of 646575575651 is 156575575646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646575575651 - 2³⁸ = 371697668707 is a prime.

It is not a weakly prime, because it can be changed into another prime (646575575621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323287787825 + 323287787826.

It is an arithmetic number, because the mean of its divisors is an integer number (323287787826).

Almost surely, 2^646575575651 is an apocalyptic number.

646575575651 is a deficient number, since it is larger than the sum of its proper divisors (1).

646575575651 is an equidigital number, since it uses as much as digits as its factorization.

646575575651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 132300000, while the sum is 62.

The spelling of 646575575651 in words is "six hundred forty-six billion, five hundred seventy-five million, five hundred seventy-five thousand, six hundred fifty-one".