63671817636 has 192 divisors, whose sum is σ = 190966325760. Its totient is φ = 17970163200.

The previous prime is 63671817563. The next prime is 63671817637.

It is a happy number.

63671817636 is a `hidden beast` number, since 6 + 367 + 181 + 76 + 36 = 666.

63671817636 is nontrivially palindromic in base 10.

63671817636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×63671817636² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (63671817637) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 49859830 + ... + 49861106.

It is an arithmetic number, because the mean of its divisors is an integer number (994616280).

Almost surely, 2^63671817636 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 63671817636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95483162880).

63671817636 is an abundant number, since it is smaller than the sum of its proper divisors (127294508124).

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

63671817636 is a wasteful number, since it uses less digits than its factorization.

63671817636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051 (or 2043 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The spelling of 63671817636 in words is "sixty-three billion, six hundred seventy-one million, eight hundred seventeen thousand, six hundred thirty-six".