68731955989 has 4 divisors (see below), whose sum is σ = 68766136000. Its totient is φ = 68697775980.

The previous prime is 68731955977. The next prime is 68731956017. The reversal of 68731955989 is 98955913786.

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 68731955989 - 2⁹ = 68731955477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68731955189) 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, 17086989 + ... + 17091010.

It is an arithmetic number, because the mean of its divisors is an integer number (17191534000).

Almost surely, 2^68731955989 is an apocalyptic number.

It is an amenable number.

68731955989 is a deficient number, since it is larger than the sum of its proper divisors (34180011).

68731955989 is a wasteful number, since it uses less digits than its factorization.

68731955989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34180010.

The product of its digits is 146966400, while the sum is 70.

The spelling of 68731955989 in words is "sixty-eight billion, seven hundred thirty-one million, nine hundred fifty-five thousand, nine hundred eighty-nine".