63981141840 has 480 divisors, whose sum is σ = 277818218496. Its totient is φ = 13294471680.

The previous prime is 63981141839. The next prime is 63981141857. The reversal of 63981141840 is 4814118936.

63981141840 is a `hidden beast` number, since 639 + 8 + 1 + 1 + 4 + 1 + 8 + 4 + 0 = 666.

It is a super-2 number, since 2×63981141840² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1475509 + ... + 1518251.

Almost surely, 2^63981141840 is an apocalyptic number.

63981141840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63981141840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138909109248).

63981141840 is an abundant number, since it is smaller than the sum of its proper divisors (213837076656).

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

63981141840 is a wasteful number, since it uses less digits than its factorization.

63981141840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42789 (or 42771 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 63981141840 in words is "sixty-three billion, nine hundred eighty-one million, one hundred forty-one thousand, eight hundred forty".