231543655440 has 80 divisors (see below), whose sum is σ = 724892193216. Its totient is φ = 61133632000.

The previous prime is 231543655429. The next prime is 231543655451. The reversal of 231543655440 is 44556345132.

It is an interprime number because it is at equal distance from previous prime (231543655429) and next prime (231543655451).

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×231543655440² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231543655392 and 231543655401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4751826 + ... + 4800305.

Almost surely, 2^231543655440 is an apocalyptic number.

231543655440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231543655440 is an abundant number, since it is smaller than the sum of its proper divisors (493348537776).

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

231543655440 is a wasteful number, since it uses less digits than its factorization.

231543655440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9552248 (or 9552242 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 42.

The spelling of 231543655440 in words is "two hundred thirty-one billion, five hundred forty-three million, six hundred fifty-five thousand, four hundred forty".