63921858947 has 4 divisors (see below), whose sum is σ = 64969758336. Its totient is φ = 62873959560.

The previous prime is 63921858943. The next prime is 63921858977. The reversal of 63921858947 is 74985812936.

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

It is a cyclic number.

It is not a de Polignac number, because 63921858947 - 2² = 63921858943 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 63921858947.

It is not an unprimeable number, because it can be changed into a prime (63921858943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 523949603 + ... + 523949724.

It is an arithmetic number, because the mean of its divisors is an integer number (16242439584).

Almost surely, 2^63921858947 is an apocalyptic number.

63921858947 is a deficient number, since it is larger than the sum of its proper divisors (1047899389).

63921858947 is a wasteful number, since it uses less digits than its factorization.

63921858947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047899388.

The product of its digits is 26127360, while the sum is 62.

The spelling of 63921858947 in words is "sixty-three billion, nine hundred twenty-one million, eight hundred fifty-eight thousand, nine hundred forty-seven".