8618992261 has 6 divisors (see below), whose sum is σ = 9473768486. Its totient is φ = 7835447400.

The previous prime is 8618992259. The next prime is 8618992267. The reversal of 8618992261 is 1622998168.

It can be written as a sum of positive squares in only one way, i.e., 4885171236 + 3733821025 = 69894^2 + 61105^2 .

It is not a de Polignac number, because 8618992261 - 2¹ = 8618992259 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8618992199 and 8618992208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8618992267) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35615550 + ... + 35615791.

Almost surely, 2^8618992261 is an apocalyptic number.

It is an amenable number.

8618992261 is a deficient number, since it is larger than the sum of its proper divisors (854776225).

8618992261 is a wasteful number, since it uses less digits than its factorization.

8618992261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71231363 (or 71231352 counting only the distinct ones).

The product of its digits is 746496, while the sum is 52.

The square root of 8618992261 is about 92838.5278911724. The cubic root of 8618992261 is about 2050.3066970044.

The spelling of 8618992261 in words is "eight billion, six hundred eighteen million, nine hundred ninety-two thousand, two hundred sixty-one".