63845270557 has 4 divisors (see below), whose sum is σ = 63847193436. Its totient is φ = 63843347680.

The previous prime is 63845270513. The next prime is 63845270579. The reversal of 63845270557 is 75507254836.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12811749721 + 51033520836 = 113189^2 + 225906^2 .

It is a cyclic number.

It is not a de Polignac number, because 63845270557 - 2¹⁵ = 63845237789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63845270507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 910744 + ... + 978337.

It is an arithmetic number, because the mean of its divisors is an integer number (15961798359).

Almost surely, 2^63845270557 is an apocalyptic number.

It is an amenable number.

63845270557 is a deficient number, since it is larger than the sum of its proper divisors (1922879).

63845270557 is a wasteful number, since it uses less digits than its factorization.

63845270557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922878.

The product of its (nonzero) digits is 7056000, while the sum is 52.

The spelling of 63845270557 in words is "sixty-three billion, eight hundred forty-five million, two hundred seventy thousand, five hundred fifty-seven".