8131631660 has 24 divisors (see below), whose sum is σ = 17118195360. Its totient is φ = 3244696704.

The previous prime is 8131631617. The next prime is 8131631663. The reversal of 8131631660 is 661361318.

It is a happy number.

It is a super-2 number, since 2×8131631660² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8131631660.

It is not an unprimeable number, because it can be changed into a prime (8131631663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 488864 + ... + 505223.

It is an arithmetic number, because the mean of its divisors is an integer number (713258140).

Almost surely, 2^8131631660 is an apocalyptic number.

It is an amenable number.

8131631660 is an abundant number, since it is smaller than the sum of its proper divisors (8986563700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8131631660 is a wasteful number, since it uses less digits than its factorization.

8131631660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994505 (or 994503 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 8131631660 is about 90175.5602145060. The cubic root of 8131631660 is about 2010.9096861668.

Adding to 8131631660 its reverse (661361318), we get a palindrome (8792992978).

The spelling of 8131631660 in words is "eight billion, one hundred thirty-one million, six hundred thirty-one thousand, six hundred sixty".