63555645 has 8 divisors (see below), whose sum is σ = 101689056. Its totient is φ = 33896336.

The previous prime is 63555629. The next prime is 63555671. The reversal of 63555645 is 54655536.

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

It is a cyclic number.

It is not a de Polignac number, because 63555645 - 2⁴ = 63555629 is a prime.

It is a super-2 number, since 2×63555645² = 8078640022732050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2118507 + ... + 2118536.

It is an arithmetic number, because the mean of its divisors is an integer number (12711132).

Almost surely, 2^63555645 is an apocalyptic number.

It is an amenable number.

63555645 is a deficient number, since it is larger than the sum of its proper divisors (38133411).

63555645 is a wasteful number, since it uses less digits than its factorization.

63555645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4237051.

The product of its digits is 270000, while the sum is 39.

The square root of 63555645 is about 7972.1794385224. The cubic root of 63555645 is about 399.0721096297.

It can be divided in two parts, 635 and 55645, that added together give a triangular number (56280 = T₃₃₅).

The spelling of 63555645 in words is "sixty-three million, five hundred fifty-five thousand, six hundred forty-five".