231551551023320 has 512 divisors, whose sum is σ = 636288974069760. Its totient is φ = 74831855616000.

The previous prime is 231551551023259. The next prime is 231551551023329. The reversal of 231551551023320 is 23320155155132.

It is a super-2 number, since 2×231551551023320² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231551551023329) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 10299866480 + ... + 10299888960.

It is an arithmetic number, because the mean of its divisors is an integer number (1242751902480).

Almost surely, 2^{231551551023320} is an apocalyptic number.

231551551023320 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 231551551023320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318144487034880).

231551551023320 is an abundant number, since it is smaller than the sum of its proper divisors (404737423046440).

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

231551551023320 is a wasteful number, since it uses less digits than its factorization.

231551551023320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23627 (or 23623 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 38.

The spelling of 231551551023320 in words is "two hundred thirty-one trillion, five hundred fifty-one billion, five hundred fifty-one million, twenty-three thousand, three hundred twenty".