42445644253 has 2 divisors, whose sum is σ = 42445644254. Its totient is φ = 42445644252.

The previous prime is 42445644247. The next prime is 42445644313. The reversal of 42445644253 is 35244654424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36015689284 + 6429954969 = 189778^2 + 80187^2 .

It is a cyclic number.

It is not a de Polignac number, because 42445644253 - 2⁵ = 42445644221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42445647253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21222822126 + 21222822127.

It is an arithmetic number, because the mean of its divisors is an integer number (21222822127).

Almost surely, 2^42445644253 is an apocalyptic number.

It is an amenable number.

42445644253 is a deficient number, since it is larger than the sum of its proper divisors (1).

42445644253 is an equidigital number, since it uses as much as digits as its factorization.

42445644253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1843200, while the sum is 43.

The spelling of 42445644253 in words is "forty-two billion, four hundred forty-five million, six hundred forty-four thousand, two hundred fifty-three".