63691786620 has 768 divisors, whose sum is σ = 258306048000. Its totient is φ = 12909093120.

The previous prime is 63691786597. The next prime is 63691786633. The reversal of 63691786620 is 2668719636.

63691786620 is a `hidden beast` number, since 6 + 3 + 6 + 9 + 1 + 7 + 8 + 6 + 620 = 666.

It is a super-2 number, since 2×63691786620² (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 a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 87608697 + ... + 87609423.

It is an arithmetic number, because the mean of its divisors is an integer number (336336000).

Almost surely, 2^63691786620 is an apocalyptic number.

63691786620 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 63691786620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129153024000).

63691786620 is an abundant number, since it is smaller than the sum of its proper divisors (194614261380).

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

63691786620 is a wasteful number, since it uses less digits than its factorization.

63691786620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820 (or 798 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 63691786620 in words is "sixty-three billion, six hundred ninety-one million, seven hundred eighty-six thousand, six hundred twenty".