540123661 has 16 divisors (see below), whose sum is σ = 675135360. Its totient is φ = 419791680.

The previous prime is 540123629. The next prime is 540123679. The reversal of 540123661 is 166321045.

It is not a de Polignac number, because 540123661 - 2⁵ = 540123629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540123061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21735 + ... + 39403.

It is an arithmetic number, because the mean of its divisors is an integer number (42195960).

Almost surely, 2^540123661 is an apocalyptic number.

It is an amenable number.

540123661 is a deficient number, since it is larger than the sum of its proper divisors (135011699).

540123661 is a wasteful number, since it uses less digits than its factorization.

540123661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18084.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 540123661 is about 23240.5606860076. The cubic root of 540123661 is about 814.3874409002.

The spelling of 540123661 in words is "five hundred forty million, one hundred twenty-three thousand, six hundred sixty-one".