3121669809786 has 16 divisors (see below), whose sum is σ = 6810915948768. Its totient is φ = 945960548400.

The previous prime is 3121669809781. The next prime is 3121669809793. The reversal of 3121669809786 is 6879089661213.

It is a super-2 number, since 2×3121669809786² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66), and also a Moran number because the ratio is a prime number: 47298027421 = 3121669809786 / (3 + 1 + 2 + 1 + 6 + 6 + 9 + 8 + 0 + 9 + 7 + 8 + 6).

It is not an unprimeable number, because it can be changed into a prime (3121669809781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23649013645 + ... + 23649013776.

It is an arithmetic number, because the mean of its divisors is an integer number (425682246798).

Almost surely, 2^{3121669809786} is an apocalyptic number.

3121669809786 is an abundant number, since it is smaller than the sum of its proper divisors (3689246138982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3121669809786 is a wasteful number, since it uses less digits than its factorization.

3121669809786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47298027437.

The product of its (nonzero) digits is 47029248, while the sum is 66.

The spelling of 3121669809786 in words is "three trillion, one hundred twenty-one billion, six hundred sixty-nine million, eight hundred nine thousand, seven hundred eighty-six".