646961357047 has 2 divisors, whose sum is σ = 646961357048. Its totient is φ = 646961357046.

The previous prime is 646961357017. The next prime is 646961357057. The reversal of 646961357047 is 740753169646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646961357047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646961356982 and 646961357000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646961357017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323480678523 + 323480678524.

It is an arithmetic number, because the mean of its divisors is an integer number (323480678524).

Almost surely, 2^646961357047 is an apocalyptic number.

646961357047 is a deficient number, since it is larger than the sum of its proper divisors (1).

646961357047 is an equidigital number, since it uses as much as digits as its factorization.

646961357047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22861440, while the sum is 58.

The spelling of 646961357047 in words is "six hundred forty-six billion, nine hundred sixty-one million, three hundred fifty-seven thousand, forty-seven".