18942761837 has 4 divisors (see below), whose sum is σ = 18943166076. Its totient is φ = 18942357600.

The previous prime is 18942761801. The next prime is 18942761839. The reversal of 18942761837 is 73816724981.

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 13834229161 + 5108532676 = 117619^2 + 71474^2 .

It is a cyclic number.

It is not a de Polignac number, because 18942761837 - 2¹⁰ = 18942760813 is a prime.

It is a super-2 number, since 2×18942761837² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18942761839) 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, 120968 + ... + 229169.

It is an arithmetic number, because the mean of its divisors is an integer number (4735791519).

Almost surely, 2^18942761837 is an apocalyptic number.

It is an amenable number.

18942761837 is a deficient number, since it is larger than the sum of its proper divisors (404239).

18942761837 is an equidigital number, since it uses as much as digits as its factorization.

18942761837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404238.

The product of its digits is 4064256, while the sum is 56.

The spelling of 18942761837 in words is "eighteen billion, nine hundred forty-two million, seven hundred sixty-one thousand, eight hundred thirty-seven".