646294801897 has 2 divisors, whose sum is σ = 646294801898. Its totient is φ = 646294801896.

The previous prime is 646294801843. The next prime is 646294801909. The reversal of 646294801897 is 798108492646.

646294801897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 402712083216 + 243582718681 = 634596^2 + 493541^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646294801897 is a prime.

It is not a weakly prime, because it can be changed into another prime (646294801597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323147400948 + 323147400949.

It is an arithmetic number, because the mean of its divisors is an integer number (323147400949).

Almost surely, 2^646294801897 is an apocalyptic number.

It is an amenable number.

646294801897 is a deficient number, since it is larger than the sum of its proper divisors (1).

646294801897 is an equidigital number, since it uses as much as digits as its factorization.

646294801897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41803776, while the sum is 64.

The spelling of 646294801897 in words is "six hundred forty-six billion, two hundred ninety-four million, eight hundred one thousand, eight hundred ninety-seven".