63572426581 has 16 divisors (see below), whose sum is σ = 67082995584. Its totient is φ = 60127873344.

The previous prime is 63572426563. The next prime is 63572426597. The reversal of 63572426581 is 18562427536.

It is a cyclic number.

It is not a de Polignac number, because 63572426581 - 2⁷ = 63572426453 is a prime.

It is a super-2 number, since 2×63572426581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63572426501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 695515 + ... + 781591.

It is an arithmetic number, because the mean of its divisors is an integer number (4192687224).

Almost surely, 2^63572426581 is an apocalyptic number.

It is an amenable number.

63572426581 is a deficient number, since it is larger than the sum of its proper divisors (3510569003).

63572426581 is a wasteful number, since it uses less digits than its factorization.

63572426581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86460.

The product of its digits is 2419200, while the sum is 49.

The spelling of 63572426581 in words is "sixty-three billion, five hundred seventy-two million, four hundred twenty-six thousand, five hundred eighty-one".