68061588981 has 4 divisors (see below), whose sum is σ = 90748785312. Its totient is φ = 45374392652.

The previous prime is 68061588961. The next prime is 68061589027. The reversal of 68061588981 is 18988516086.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68061588981 - 2¹³ = 68061580789 is a prime.

It is a super-2 number, since 2×68061588981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68061588901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11343598161 + ... + 11343598166.

It is an arithmetic number, because the mean of its divisors is an integer number (22687196328).

Almost surely, 2^68061588981 is an apocalyptic number.

It is an amenable number.

68061588981 is a deficient number, since it is larger than the sum of its proper divisors (22687196331).

68061588981 is a wasteful number, since it uses less digits than its factorization.

68061588981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22687196330.

The product of its (nonzero) digits is 6635520, while the sum is 60.

The spelling of 68061588981 in words is "sixty-eight billion, sixty-one million, five hundred eighty-eight thousand, nine hundred eighty-one".