67645734912 has 186 divisors, whose sum is σ = 223338299288. Its totient is φ = 19327352832.

The previous prime is 67645734901. The next prime is 67645734917. The reversal of 67645734912 is 21943754676.

67645734912 is a `hidden beast` number, since 6 + 7 + 64 + 573 + 4 + 9 + 1 + 2 = 666.

Its product of digits (7620480) is a multiple of the sum of its prime divisors (12).

It is a nialpdrome in base 2, base 4, base 8 and base 16.

It is a zygodrome in base 2, base 4 and base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67645734917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9663676413 + ... + 9663676419.

Almost surely, 2^67645734912 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 67645734912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111669149644).

67645734912 is an abundant number, since it is smaller than the sum of its proper divisors (155692564376).

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

67645734912 is an frugal number, since it uses more digits than its factorization.

67645734912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73 (or 12 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 54.

The spelling of 67645734912 in words is "sixty-seven billion, six hundred forty-five million, seven hundred thirty-four thousand, nine hundred twelve".