63954878394 has 48 divisors (see below), whose sum is σ = 141407987616. Its totient is φ = 19268203680.

The previous prime is 63954878381. The next prime is 63954878423. The reversal of 63954878394 is 49387845936.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 129004 + ... + 380199.

It is an arithmetic number, because the mean of its divisors is an integer number (2945999742).

Almost surely, 2^63954878394 is an apocalyptic number.

63954878394 is an abundant number, since it is smaller than the sum of its proper divisors (77453109222).

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

63954878394 is a wasteful number, since it uses less digits than its factorization.

63954878394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509403 (or 509392 counting only the distinct ones).

The product of its digits is 156764160, while the sum is 66.

The spelling of 63954878394 in words is "sixty-three billion, nine hundred fifty-four million, eight hundred seventy-eight thousand, three hundred ninety-four".