63530878655 has 4 divisors (see below), whose sum is σ = 76237054392. Its totient is φ = 50824702920.

The previous prime is 63530878643. The next prime is 63530878661. The reversal of 63530878655 is 55687803536.

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

It is not a de Polignac number, because 63530878655 - 2²⁶ = 63463769791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63530878655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6353087861 + ... + 6353087870.

It is an arithmetic number, because the mean of its divisors is an integer number (19059263598).

Almost surely, 2^63530878655 is an apocalyptic number.

63530878655 is a deficient number, since it is larger than the sum of its proper divisors (12706175737).

63530878655 is a wasteful number, since it uses less digits than its factorization.

63530878655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12706175736.

The product of its (nonzero) digits is 18144000, while the sum is 56.

The spelling of 63530878655 in words is "sixty-three billion, five hundred thirty million, eight hundred seventy-eight thousand, six hundred fifty-five".