231172171640 has 128 divisors (see below), whose sum is σ = 533656166400. Its totient is φ = 90100200960.

The previous prime is 231172171639. The next prime is 231172171651. The reversal of 231172171640 is 46171271132.

It is a self number, because there is not a number n which added to its sum of digits gives 231172171640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142610030 + ... + 142611650.

It is an arithmetic number, because the mean of its divisors is an integer number (4169188800).

Almost surely, 2^231172171640 is an apocalyptic number.

231172171640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231172171640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266828083200).

231172171640 is an abundant number, since it is smaller than the sum of its proper divisors (302483994760).

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

231172171640 is a wasteful number, since it uses less digits than its factorization.

231172171640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245 (or 2241 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 35.

The spelling of 231172171640 in words is "two hundred thirty-one billion, one hundred seventy-two million, one hundred seventy-one thousand, six hundred forty".