63817578923 has 16 divisors (see below), whose sum is σ = 73461672960. Its totient is φ = 54305748000.

The previous prime is 63817578883. The next prime is 63817578971. The reversal of 63817578923 is 32987571836.

It is a happy number.

It is not a de Polignac number, because 63817578923 - 2¹⁰ = 63817577899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63817578823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1822898 + ... + 1857576.

It is an arithmetic number, because the mean of its divisors is an integer number (4591354560).

Almost surely, 2^63817578923 is an apocalyptic number.

63817578923 is a deficient number, since it is larger than the sum of its proper divisors (9644094037).

63817578923 is a wasteful number, since it uses less digits than its factorization.

63817578923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36578.

The product of its digits is 15240960, while the sum is 59.

The spelling of 63817578923 in words is "sixty-three billion, eight hundred seventeen million, five hundred seventy-eight thousand, nine hundred twenty-three".