9621878834671 has 4 divisors (see below), whose sum is σ = 10128293510200. Its totient is φ = 9115464159144.

The previous prime is 9621878834651. The next prime is 9621878834681. The reversal of 9621878834671 is 1764388781269.

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

It is a cyclic number.

It is not a de Polignac number, because 9621878834671 - 2⁵ = 9621878834639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9621878834671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9621878834611) 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, 253207337736 + ... + 253207337773.

It is an arithmetic number, because the mean of its divisors is an integer number (2532073377550).

Almost surely, 2^{9621878834671} is an apocalyptic number.

9621878834671 is a deficient number, since it is larger than the sum of its proper divisors (506414675529).

9621878834671 is a wasteful number, since it uses less digits than its factorization.

9621878834671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506414675528.

The product of its digits is 195084288, while the sum is 70.

The spelling of 9621878834671 in words is "nine trillion, six hundred twenty-one billion, eight hundred seventy-eight million, eight hundred thirty-four thousand, six hundred seventy-one".