540081121639 has 4 divisors (see below), whose sum is σ = 544333729024. Its totient is φ = 535828514256.

The previous prime is 540081121609. The next prime is 540081121661. The reversal of 540081121639 is 936121180045.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 540081121639 - 2⁷ = 540081121511 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 (540081121609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2126303502 + ... + 2126303755.

It is an arithmetic number, because the mean of its divisors is an integer number (136083432256).

Almost surely, 2^540081121639 is an apocalyptic number.

540081121639 is a deficient number, since it is larger than the sum of its proper divisors (4252607385).

540081121639 is a wasteful number, since it uses less digits than its factorization.

540081121639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4252607384.

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 540081121639 in words is "five hundred forty billion, eighty-one million, one hundred twenty-one thousand, six hundred thirty-nine".