646346406536507 has 2 divisors, whose sum is σ = 646346406536508. Its totient is φ = 646346406536506.

The previous prime is 646346406536497. The next prime is 646346406536533. The reversal of 646346406536507 is 705635604643646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646346406536507 - 2⁴ = 646346406536491 is a prime.

It is a super-2 number, since 2×646346406536507² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (646346406536587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323173203268253 + 323173203268254.

It is an arithmetic number, because the mean of its divisors is an integer number (323173203268254).

Almost surely, 2^{646346406536507} is an apocalyptic number.

646346406536507 is a deficient number, since it is larger than the sum of its proper divisors (1).

646346406536507 is an equidigital number, since it uses as much as digits as its factorization.

646346406536507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 783820800, while the sum is 65.

The spelling of 646346406536507 in words is "six hundred forty-six trillion, three hundred forty-six billion, four hundred six million, five hundred thirty-six thousand, five hundred seven".