68245815121 has 45 divisors (see below), whose sum is σ = 80378428395. Its totient is φ = 57932360640.

The previous prime is 68245815107. The next prime is 68245815137. The reversal of 68245815121 is 12151854286.

The square root of 68245815121 is 261239.

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

It can be written as a sum of positive squares in only one way, i.e., 53132555025 + 15113260096 = 230505^2 + 122936^2 .

It is not a de Polignac number, because 68245815121 - 2⁵ = 68245815089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68245885121) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 537368560 + ... + 537368686.

Almost surely, 2^68245815121 is an apocalyptic number.

68245815121 is the 261239-th square number.

68245815121 is the 130620-th centered octagonal number.

It is an amenable number.

68245815121 is a deficient number, since it is larger than the sum of its proper divisors (12132613274).

68245815121 is an frugal number, since it uses more digits than its factorization.

68245815121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332 (or 155 counting only the distinct ones).

The product of its digits is 153600, while the sum is 43.

The spelling of 68245815121 in words is "sixty-eight billion, two hundred forty-five million, eight hundred fifteen thousand, one hundred twenty-one".