68019769636 has 81 divisors (see below), whose sum is σ = 150044312691. Its totient is φ = 26890141824.

The previous prime is 68019769619. The next prime is 68019769637. The reversal of 68019769636 is 63696791086.

The square root of 68019769636 is 260806.

It is a perfect power (a square), and thus also a powerful number.

68019769636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 65707236 + 67954062400 = 8106^2 + 260680^2 .

It is a super-2 number, since 2×68019769636² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68019769637) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 47465976 + ... + 47467408.

Almost surely, 2^68019769636 is an apocalyptic number.

68019769636 is the 260806-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68019769636

68019769636 is an abundant number, since it is smaller than the sum of its proper divisors (82024543055).

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

68019769636 is a wasteful number, since it uses less digits than its factorization.

68019769636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2910 (or 1455 counting only the distinct ones).

The product of its (nonzero) digits is 17635968, while the sum is 61.

The spelling of 68019769636 in words is "sixty-eight billion, nineteen million, seven hundred sixty-nine thousand, six hundred thirty-six".