68365297525561 has 3 divisors (see below), whose sum is σ = 68365305793893. Its totient is φ = 68365289257230.

The previous prime is 68365297525549. The next prime is 68365297525619. The reversal of 68365297525561 is 16552579256386.

The square root of 68365297525561 is 8268331.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 68365297525561 - 2⁷ = 68365297525433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68365297525501) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4134166 + ... + 12402496.

It is an arithmetic number, because the mean of its divisors is an integer number (22788435264631).

Almost surely, 2^{68365297525561} is an apocalyptic number.

68365297525561 is the 8268331-st square number.

68365297525561 is the 4134166-th centered octagonal number.

It is an amenable number.

68365297525561 is a deficient number, since it is larger than the sum of its proper divisors (8268332).

68365297525561 is an frugal number, since it uses more digits than its factorization.

68365297525561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16536662 (or 8268331 counting only the distinct ones).

The product of its digits is 816480000, while the sum is 70.

The spelling of 68365297525561 in words is "sixty-eight trillion, three hundred sixty-five billion, two hundred ninety-seven million, five hundred twenty-five thousand, five hundred sixty-one".