540123643566 has 48 divisors (see below), whose sum is σ = 1260549579744. Its totient is φ = 166157462592.

The previous prime is 540123643541. The next prime is 540123643567. The reversal of 540123643566 is 665346321045.

540123643566 is a `hidden beast` number, since 5 + 4 + 0 + 1 + 23 + 64 + 3 + 566 = 666.

It is a super-2 number, since 2×540123643566² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540123643567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 904575 + ... + 1377861.

It is an arithmetic number, because the mean of its divisors is an integer number (26261449578).

Almost surely, 2^540123643566 is an apocalyptic number.

540123643566 is an abundant number, since it is smaller than the sum of its proper divisors (720425936178).

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

540123643566 is a wasteful number, since it uses less digits than its factorization.

540123643566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478185 (or 478182 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 45.

The spelling of 540123643566 in words is "five hundred forty billion, one hundred twenty-three million, six hundred forty-three thousand, five hundred sixty-six".