68971238581 has 4 divisors (see below), whose sum is σ = 78824272672. Its totient is φ = 59118204492.

The previous prime is 68971238563. The next prime is 68971238597. The reversal of 68971238581 is 18583217986.

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 68971238581 - 2⁵ = 68971238549 is a prime.

It is a super-2 number, since 2×68971238581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68971238521) 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, 4926517035 + ... + 4926517048.

It is an arithmetic number, because the mean of its divisors is an integer number (19706068168).

Almost surely, 2^68971238581 is an apocalyptic number.

It is an amenable number.

68971238581 is a deficient number, since it is larger than the sum of its proper divisors (9853034091).

68971238581 is an equidigital number, since it uses as much as digits as its factorization.

68971238581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9853034090.

The product of its digits is 5806080, while the sum is 58.

The spelling of 68971238581 in words is "sixty-eight billion, nine hundred seventy-one million, two hundred thirty-eight thousand, five hundred eighty-one".