20344316451637 has 2 divisors, whose sum is σ = 20344316451638. Its totient is φ = 20344316451636.

The previous prime is 20344316451593. The next prime is 20344316451709. The reversal of 20344316451637 is 73615461344302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16000952014161 + 4343364437476 = 4000119^2 + 2084074^2 .

It is a cyclic number.

It is not a de Polignac number, because 20344316451637 - 2⁷ = 20344316451509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20344316451337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172158225818 + 10172158225819.

It is an arithmetic number, because the mean of its divisors is an integer number (10172158225819).

Almost surely, 2^{20344316451637} is an apocalyptic number.

It is an amenable number.

20344316451637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20344316451637 is an equidigital number, since it uses as much as digits as its factorization.

20344316451637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 49.

Adding to 20344316451637 its reverse (73615461344302), we get a palindrome (93959777795939).

The spelling of 20344316451637 in words is "twenty trillion, three hundred forty-four billion, three hundred sixteen million, four hundred fifty-one thousand, six hundred thirty-seven".