68939029043889 has 4 divisors (see below), whose sum is σ = 91918705391856. Its totient is φ = 45959352695924.

The previous prime is 68939029043881. The next prime is 68939029043921. The reversal of 68939029043889 is 98834092093986.

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 68939029043889 - 2³ = 68939029043881 is a prime.

It is a super-3 number, since 3×68939029043889³ (a number of 42 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (68939029043881) 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, 11489838173979 + ... + 11489838173984.

It is an arithmetic number, because the mean of its divisors is an integer number (22979676347964).

Almost surely, 2^{68939029043889} is an apocalyptic number.

It is an amenable number.

68939029043889 is a deficient number, since it is larger than the sum of its proper divisors (22979676347967).

68939029043889 is a wasteful number, since it uses less digits than its factorization.

68939029043889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22979676347966.

The product of its (nonzero) digits is 1451188224, while the sum is 78.

The spelling of 68939029043889 in words is "sixty-eight trillion, nine hundred thirty-nine billion, twenty-nine million, forty-three thousand, eight hundred eighty-nine".