18042977941 has 4 divisors (see below), whose sum is σ = 18142663084. Its totient is φ = 17943292800.

The previous prime is 18042977933. The next prime is 18042977947. The reversal of 18042977941 is 14977924081.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3331713841 + 14711264100 = 57721^2 + 121290^2 .

It is a cyclic number.

It is not a de Polignac number, because 18042977941 - 2³ = 18042977933 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 (18042977947) 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, 49842300 + ... + 49842661.

It is an arithmetic number, because the mean of its divisors is an integer number (4535665771).

Almost surely, 2^18042977941 is an apocalyptic number.

It is an amenable number.

18042977941 is a deficient number, since it is larger than the sum of its proper divisors (99685143).

18042977941 is an equidigital number, since it uses as much as digits as its factorization.

18042977941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99685142.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The spelling of 18042977941 in words is "eighteen billion, forty-two million, nine hundred seventy-seven thousand, nine hundred forty-one".