63919278655 has 4 divisors (see below), whose sum is σ = 76703134392. Its totient is φ = 51135422920.

The previous prime is 63919278649. The next prime is 63919278667. The reversal of 63919278655 is 55687291936.

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

It is not a de Polignac number, because 63919278655 - 2⁵ = 63919278623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63919278593 and 63919278602.

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, 6391927861 + ... + 6391927870.

It is an arithmetic number, because the mean of its divisors is an integer number (19175783598).

Almost surely, 2^63919278655 is an apocalyptic number.

63919278655 is a deficient number, since it is larger than the sum of its proper divisors (12783855737).

63919278655 is a wasteful number, since it uses less digits than its factorization.

63919278655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12783855736.

The product of its digits is 24494400, while the sum is 61.

The spelling of 63919278655 in words is "sixty-three billion, nine hundred nineteen million, two hundred seventy-eight thousand, six hundred fifty-five".