63491837648064 has 168 divisors, whose sum is σ = 195673733325360. Its totient is φ = 18116559304704.

The previous prime is 63491837648047. The next prime is 63491837648081. The reversal of 63491837648064 is 46084673819436.

It is an interprime number because it is at equal distance from previous prime (63491837648047) and next prime (63491837648081).

It is a tau number, because it is divible by the number of its divisors (168).

It is a hoax number, since the sum of its digits (69) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 63491837648064.

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, 2664322 + ... + 11579390.

Almost surely, 2^{63491837648064} is an apocalyptic number.

63491837648064 is a gapful number since it is divisible by the number (64) 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 63491837648064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97836866662680).

63491837648064 is an abundant number, since it is smaller than the sum of its proper divisors (132181895677296).

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

63491837648064 is a wasteful number, since it uses less digits than its factorization.

63491837648064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8915855 (or 8915838 counting only the distinct ones).

The product of its (nonzero) digits is 501645312, while the sum is 69.

The spelling of 63491837648064 in words is "sixty-three trillion, four hundred ninety-one billion, eight hundred thirty-seven million, six hundred forty-eight thousand, sixty-four".