69879666861 has 12 divisors (see below), whose sum is σ = 100942492092. Its totient is φ = 46584046656.

The previous prime is 69879666839. The next prime is 69879666869. The reversal of 69879666861 is 16866697896.

It can be written as a sum of positive squares in 2 ways, for example, as 49048517961 + 20831148900 = 221469^2 + 144330^2 .

It is not a de Polignac number, because 69879666861 - 2¹⁰ = 69879665837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 69879666861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69879666869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5296 + ... + 373881.

It is an arithmetic number, because the mean of its divisors is an integer number (8411874341).

Almost surely, 2^69879666861 is an apocalyptic number.

It is an amenable number.

69879666861 is a deficient number, since it is larger than the sum of its proper divisors (31062825231).

69879666861 is a wasteful number, since it uses less digits than its factorization.

69879666861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399660 (or 399657 counting only the distinct ones).

The product of its digits is 282175488, while the sum is 72.

The spelling of 69879666861 in words is "sixty-nine billion, eight hundred seventy-nine million, six hundred sixty-six thousand, eight hundred sixty-one".