6661231104540 has 24 divisors (see below), whose sum is σ = 18651447092880. Its totient is φ = 1776328294528.

The previous prime is 6661231104527. The next prime is 6661231104637. The reversal of 6661231104540 is 454011321666.

It is a super-2 number, since 2×6661231104540² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 55510259145 + ... + 55510259264.

It is an arithmetic number, because the mean of its divisors is an integer number (777143628870).

Almost surely, 2^{6661231104540} is an apocalyptic number.

6661231104540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6661231104540 is an abundant number, since it is smaller than the sum of its proper divisors (11990215988340).

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

6661231104540 is a wasteful number, since it uses less digits than its factorization.

6661231104540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111020518421 (or 111020518419 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 6661231104540 in words is "six trillion, six hundred sixty-one billion, two hundred thirty-one million, one hundred four thousand, five hundred forty".