63953349894 has 72 divisors (see below), whose sum is σ = 161653839048. Its totient is φ = 18219640320.

The previous prime is 63953349881. The next prime is 63953349917. The reversal of 63953349894 is 49894335936.

63953349894 is a `hidden beast` number, since 6 + 3 + 9 + 53 + 3 + 498 + 94 = 666.

It is a super-2 number, since 2×63953349894² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 201574 + ... + 410534.

It is an arithmetic number, because the mean of its divisors is an integer number (2245192209).

Almost surely, 2^63953349894 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63953349894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80826919524).

63953349894 is an abundant number, since it is smaller than the sum of its proper divisors (97700489154).

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

63953349894 is a wasteful number, since it uses less digits than its factorization.

63953349894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209330 (or 209320 counting only the distinct ones).

The product of its digits is 75582720, while the sum is 63.

The spelling of 63953349894 in words is "sixty-three billion, nine hundred fifty-three million, three hundred forty-nine thousand, eight hundred ninety-four".