68972533613 has 4 divisors (see below), whose sum is σ = 69061761468. Its totient is φ = 68883305760.

The previous prime is 68972533577. The next prime is 68972533621. The reversal of 68972533613 is 31633527986.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25114959529 + 43857574084 = 158477^2 + 209422^2 .

It is a cyclic number.

It is not a de Polignac number, because 68972533613 - 2¹⁶ = 68972468077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68992533613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44612768 + ... + 44614313.

It is an arithmetic number, because the mean of its divisors is an integer number (17265440367).

Almost surely, 2^68972533613 is an apocalyptic number.

It is an amenable number.

68972533613 is a deficient number, since it is larger than the sum of its proper divisors (89227855).

68972533613 is an equidigital number, since it uses as much as digits as its factorization.

68972533613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89227854.

The product of its digits is 4898880, while the sum is 53.

The spelling of 68972533613 in words is "sixty-eight billion, nine hundred seventy-two million, five hundred thirty-three thousand, six hundred thirteen".