85813812453637 has 2 divisors, whose sum is σ = 85813812453638. Its totient is φ = 85813812453636.

The previous prime is 85813812453563. The next prime is 85813812453653. The reversal of 85813812453637 is 73635421831858.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43039714137156 + 42774098316481 = 6560466^2 + 6540191^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85813812453637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85813812453037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42906906226818 + 42906906226819.

It is an arithmetic number, because the mean of its divisors is an integer number (42906906226819).

Almost surely, 2^{85813812453637} is an apocalyptic number.

It is an amenable number.

85813812453637 is a deficient number, since it is larger than the sum of its proper divisors (1).

85813812453637 is an equidigital number, since it uses as much as digits as its factorization.

85813812453637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116121600, while the sum is 64.

The spelling of 85813812453637 in words is "eighty-five trillion, eight hundred thirteen billion, eight hundred twelve million, four hundred fifty-three thousand, six hundred thirty-seven".