18946536877 has 4 divisors (see below), whose sum is σ = 19000210140. Its totient is φ = 18892863616.

The previous prime is 18946536863. The next prime is 18946536953. The reversal of 18946536877 is 77863564981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77863564981 = 41 ⋅1899111341.

It can be written as a sum of positive squares in 2 ways, for example, as 11831783076 + 7114753801 = 108774^2 + 84349^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18946536877 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 (18946536277) 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, 26836102 + ... + 26836807.

It is an arithmetic number, because the mean of its divisors is an integer number (4750052535).

Almost surely, 2^18946536877 is an apocalyptic number.

It is an amenable number.

18946536877 is a deficient number, since it is larger than the sum of its proper divisors (53673263).

18946536877 is an equidigital number, since it uses as much as digits as its factorization.

18946536877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53673262.

The product of its digits is 60963840, while the sum is 64.

The spelling of 18946536877 in words is "eighteen billion, nine hundred forty-six million, five hundred thirty-six thousand, eight hundred seventy-seven".