63953349856 has 48 divisors (see below), whose sum is σ = 137608653168. Its totient is φ = 29015884800.

The previous prime is 63953349833. The next prime is 63953349857. The reversal of 63953349856 is 65894335936.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 63953349794 and 63953349803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63953349857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22516 + ... + 358348.

It is an arithmetic number, because the mean of its divisors is an integer number (2866846941).

Almost surely, 2^63953349856 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 63953349856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68804326584).

63953349856 is an abundant number, since it is smaller than the sum of its proper divisors (73655303312).

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

63953349856 is a wasteful number, since it uses less digits than its factorization.

63953349856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336395 (or 336387 counting only the distinct ones).

The product of its digits is 62985600, while the sum is 61.

The spelling of 63953349856 in words is "sixty-three billion, nine hundred fifty-three million, three hundred forty-nine thousand, eight hundred fifty-six".