68979216629 has 4 divisors (see below), whose sum is σ = 70446859584. Its totient is φ = 67511573676.

The previous prime is 68979216583. The next prime is 68979216637. The reversal of 68979216629 is 92661297986.

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 68979216629 - 2²⁰ = 68978168053 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 (68979216659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 733821407 + ... + 733821500.

It is an arithmetic number, because the mean of its divisors is an integer number (17611714896).

Almost surely, 2^68979216629 is an apocalyptic number.

It is an amenable number.

68979216629 is a deficient number, since it is larger than the sum of its proper divisors (1467642955).

68979216629 is a wasteful number, since it uses less digits than its factorization.

68979216629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467642954.

The product of its digits is 35271936, while the sum is 65.

The spelling of 68979216629 in words is "sixty-eight billion, nine hundred seventy-nine million, two hundred sixteen thousand, six hundred twenty-nine".