8266197621 has 16 divisors (see below), whose sum is σ = 12025355328. Its totient is φ = 5009068800.

The previous prime is 8266197593. The next prime is 8266197637. The reversal of 8266197621 is 1267916628.

It is not a de Polignac number, because 8266197621 - 2²⁶ = 8199088757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8266197661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274125 + ... + 302781.

It is an arithmetic number, because the mean of its divisors is an integer number (751584708).

Almost surely, 2^8266197621 is an apocalyptic number.

It is an amenable number.

8266197621 is a deficient number, since it is larger than the sum of its proper divisors (3759157707).

8266197621 is a wasteful number, since it uses less digits than its factorization.

8266197621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37412.

The product of its digits is 435456, while the sum is 48.

The square root of 8266197621 is about 90918.6318693809. The cubic root of 8266197621 is about 2021.9415392330.

The spelling of 8266197621 in words is "eight billion, two hundred sixty-six million, one hundred ninety-seven thousand, six hundred twenty-one".