63613561 has 8 divisors (see below), whose sum is σ = 72414144. Its totient is φ = 55315920.

The previous prime is 63613547. The next prime is 63613567. The reversal of 63613561 is 16531636.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 63613561 - 2⁹ = 63613049 is a prime.

It is a super-3 number, since 3×63613561³ (a number of 24 digits) contains 333 as substring.

It is a pancake number, because a pancake can be divided into 63613561 parts by 11279 straight cuts.

It is not an unprimeable number, because it can be changed into a prime (63613567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125466 + ... + 125971.

It is an arithmetic number, because the mean of its divisors is an integer number (9051768).

Almost surely, 2^63613561 is an apocalyptic number.

It is an amenable number.

63613561 is a deficient number, since it is larger than the sum of its proper divisors (8800583).

63613561 is a wasteful number, since it uses less digits than its factorization.

63613561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251471.

The product of its digits is 9720, while the sum is 31.

The square root of 63613561 is about 7975.8109932470. The cubic root of 63613561 is about 399.1932929029.

The spelling of 63613561 in words is "sixty-three million, six hundred thirteen thousand, five hundred sixty-one".