831566643953 has 2 divisors, whose sum is σ = 831566643954. Its totient is φ = 831566643952.

The previous prime is 831566643913. The next prime is 831566643961. The reversal of 831566643953 is 359346665138.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 635682506209 + 195884137744 = 797297^2 + 442588^2 .

It is a cyclic number.

It is not a de Polignac number, because 831566643953 - 2⁶ = 831566643889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 831566643892 and 831566643901.

It is not a weakly prime, because it can be changed into another prime (831566643913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415783321976 + 415783321977.

It is an arithmetic number, because the mean of its divisors is an integer number (415783321977).

Almost surely, 2^831566643953 is an apocalyptic number.

It is an amenable number.

831566643953 is a deficient number, since it is larger than the sum of its proper divisors (1).

831566643953 is an equidigital number, since it uses as much as digits as its factorization.

831566643953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41990400, while the sum is 59.

The spelling of 831566643953 in words is "eight hundred thirty-one billion, five hundred sixty-six million, six hundred forty-three thousand, nine hundred fifty-three".