646063043677 has 2 divisors, whose sum is σ = 646063043678. Its totient is φ = 646063043676.

The previous prime is 646063043603. The next prime is 646063043707. The reversal of 646063043677 is 776340360646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 478412922276 + 167650121401 = 691674^2 + 409451^2 .

It is a cyclic number.

It is not a de Polignac number, because 646063043677 - 2¹¹ = 646063041629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646063043177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323031521838 + 323031521839.

It is an arithmetic number, because the mean of its divisors is an integer number (323031521839).

Almost surely, 2^646063043677 is an apocalyptic number.

It is an amenable number.

646063043677 is a deficient number, since it is larger than the sum of its proper divisors (1).

646063043677 is an equidigital number, since it uses as much as digits as its factorization.

646063043677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9144576, while the sum is 52.

The spelling of 646063043677 in words is "six hundred forty-six billion, sixty-three million, forty-three thousand, six hundred seventy-seven".