68686263522 has 90 divisors (see below), whose sum is σ = 157010818833. Its totient is φ = 22442872176.

The previous prime is 68686263517. The next prime is 68686263553. The reversal of 68686263522 is 22536268686.

68686263522 is a `hidden beast` number, since 6 + 8 + 6 + 8 + 626 + 3 + 5 + 2 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 64693413801 + 3992849721 = 254349^2 + 63189^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=185319.

It is a super-2 number, since 2×68686263522² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 196808604 + ... + 196808952.

Almost surely, 2^68686263522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68686263522

68686263522 is an abundant number, since it is smaller than the sum of its proper divisors (88324555311).

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

68686263522 is an frugal number, since it uses more digits than its factorization.

68686263522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830 (or 413 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 54.

The spelling of 68686263522 in words is "sixty-eight billion, six hundred eighty-six million, two hundred sixty-three thousand, five hundred twenty-two".