67575781812 has 144 divisors (see below), whose sum is σ = 200220830208. Its totient is φ = 17541074880.

The previous prime is 67575781769. The next prime is 67575781877. The reversal of 67575781812 is 21818757576.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17118823 + ... + 17122769.

It is an arithmetic number, because the mean of its divisors is an integer number (1390422432).

Almost surely, 2^67575781812 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 67575781812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100110415104).

67575781812 is an abundant number, since it is smaller than the sum of its proper divisors (132645048396).

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

67575781812 is a wasteful number, since it uses less digits than its factorization.

67575781812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6626 (or 6617 counting only the distinct ones).

The product of its digits is 6585600, while the sum is 57.

The spelling of 67575781812 in words is "sixty-seven billion, five hundred seventy-five million, seven hundred eighty-one thousand, eight hundred twelve".