20698661286458 has 8 divisors (see below), whose sum is σ = 31256367714900. Its totient is φ = 10279872048160.

The previous prime is 20698661286451. The next prime is 20698661286461. The reversal of 20698661286458 is 85468216689602.

It can be written as a sum of positive squares in 2 ways, for example, as 19221797127289 + 1476864159169 = 4384267^2 + 1215263^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20698661286391 and 20698661286400.

It is not an unprimeable number, because it can be changed into a prime (20698661286451) 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, 34729297163 + ... + 34729297758.

Almost surely, 2^{20698661286458} is an apocalyptic number.

20698661286458 is a deficient number, since it is larger than the sum of its proper divisors (10557706428442).

20698661286458 is a wasteful number, since it uses less digits than its factorization.

20698661286458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69458595072.

The product of its (nonzero) digits is 477757440, while the sum is 71.

The spelling of 20698661286458 in words is "twenty trillion, six hundred ninety-eight billion, six hundred sixty-one million, two hundred eighty-six thousand, four hundred fifty-eight".