63949904550 has 216 divisors, whose sum is σ = 207238829616. Its totient is φ = 13847552640.

The previous prime is 63949904527. The next prime is 63949904561. The reversal of 63949904550 is 5540994936.

63949904550 is a `hidden beast` number, since 63 + 9 + 49 + 90 + 455 + 0 = 666.

It is a super-2 number, since 2×63949904550² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 1109032 + ... + 1165268.

It is an arithmetic number, because the mean of its divisors is an integer number (959439026).

Almost surely, 2^63949904550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63949904550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103619414808).

63949904550 is an abundant number, since it is smaller than the sum of its proper divisors (143288925066).

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

63949904550 is a wasteful number, since it uses less digits than its factorization.

63949904550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56300 (or 56273 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 54.

The spelling of 63949904550 in words is "sixty-three billion, nine hundred forty-nine million, nine hundred four thousand, five hundred fifty".