231555040000 has 90 divisors (see below), whose sum is σ = 577572477020. Its totient is φ = 92621952000.

The previous prime is 231555039967. The next prime is 231555040001. The reversal of 231555040000 is 40555132.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (231555040001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 563610 + ... + 883609.

Almost surely, 2^231555040000 is an apocalyptic number.

231555040000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231555040000 is an abundant number, since it is smaller than the sum of its proper divisors (346017437020).

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

231555040000 is an frugal number, since it uses more digits than its factorization.

231555040000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447255 (or 1447226 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

Adding to 231555040000 its reverse (40555132), we get a palindrome (231595595132).

The spelling of 231555040000 in words is "two hundred thirty-one billion, five hundred fifty-five million, forty thousand".