63999999999904 has 96 divisors (see below), whose sum is σ = 132842660985216. Its totient is φ = 30291100139520.

The previous prime is 63999999999839. The next prime is 63999999999907. The reversal of 63999999999904 is 40999999999936.

It is a junction number, because it is equal to n+sod(n) for n = 63999999999794 and 63999999999803.

It is not an unprimeable number, because it can be changed into a prime (63999999999907) 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, 1867668979 + ... + 1867703245.

It is an arithmetic number, because the mean of its divisors is an integer number (1383777718596).

Almost surely, 2^{63999999999904} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63999999999904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66421330492608).

63999999999904 is an abundant number, since it is smaller than the sum of its proper divisors (68842660985312).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63999999999904 is a wasteful number, since it uses less digits than its factorization.

63999999999904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60558 (or 60550 counting only the distinct ones).

The product of its (nonzero) digits is 251048476872, while the sum is 103.

The spelling of 63999999999904 in words is "sixty-three trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred four".