68209778929 has 4 divisors (see below), whose sum is σ = 72222118884. Its totient is φ = 64197438976.

The previous prime is 68209778893. The next prime is 68209778951. The reversal of 68209778929 is 92987790286.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27573266704 + 40636512225 = 166052^2 + 201585^2 .

It is a cyclic number.

It is not a de Polignac number, because 68209778929 - 2²⁷ = 68075561201 is a prime.

It is a super-3 number, since 3×68209778929³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68209778999) 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, 2006169952 + ... + 2006169985.

It is an arithmetic number, because the mean of its divisors is an integer number (18055529721).

Almost surely, 2^68209778929 is an apocalyptic number.

It is an amenable number.

68209778929 is a deficient number, since it is larger than the sum of its proper divisors (4012339955).

68209778929 is a wasteful number, since it uses less digits than its factorization.

68209778929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4012339954.

The product of its (nonzero) digits is 54867456, while the sum is 67.

The spelling of 68209778929 in words is "sixty-eight billion, two hundred nine million, seven hundred seventy-eight thousand, nine hundred twenty-nine".