9888427400569 has 3 divisors (see below), whose sum is σ = 9888430545157. Its totient is φ = 9888424255982.

The previous prime is 9888427400563. The next prime is 9888427400587. The reversal of 9888427400569 is 9650047248889.

The square root of 9888427400569 is 3144587.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 9888427400569 - 2²¹ = 9888425303417 is a prime.

It is a super-2 number, since 2×9888427400569² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9888427400498 and 9888427400507.

It is not an unprimeable number, because it can be changed into a prime (9888427400563) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1572294 + ... + 4716880.

Almost surely, 2^{9888427400569} is an apocalyptic number.

9888427400569 is the 3144587-th square number.

9888427400569 is the 1572294-th centered octagonal number.

It is an amenable number.

9888427400569 is a deficient number, since it is larger than the sum of its proper divisors (3144588).

9888427400569 is an frugal number, since it uses more digits than its factorization.

9888427400569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6289174 (or 3144587 counting only the distinct ones).

The product of its (nonzero) digits is 278691840, while the sum is 70.

The spelling of 9888427400569 in words is "nine trillion, eight hundred eighty-eight billion, four hundred twenty-seven million, four hundred thousand, five hundred sixty-nine".