68449945536 has 420 divisors, whose sum is σ = 242447371848. Its totient is φ = 19025943552.

The previous prime is 68449945483. The next prime is 68449945541. The reversal of 68449945536 is 63554994486.

68449945536 is a `hidden beast` number, since 6 + 8 + 4 + 4 + 9 + 94 + 5 + 536 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 9394951 + ... + 9402233.

Almost surely, 2^68449945536 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 68449945536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121223685924).

68449945536 is an abundant number, since it is smaller than the sum of its proper divisors (173997426312).

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

68449945536 is a wasteful number, since it uses less digits than its factorization.

68449945536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7358 (or 7332 counting only the distinct ones).

The product of its digits is 111974400, while the sum is 63.

The spelling of 68449945536 in words is "sixty-eight billion, four hundred forty-nine million, nine hundred forty-five thousand, five hundred thirty-six".