18036977677 has 4 divisors (see below), whose sum is σ = 18040905916. Its totient is φ = 18033049440.

The previous prime is 18036977653. The next prime is 18036977681. The reversal of 18036977677 is 77677963081.

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 406183716 + 17630793961 = 20154^2 + 132781^2 .

It is a cyclic number.

It is not a de Polignac number, because 18036977677 - 2¹¹ = 18036975629 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 (18036977617) 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, 1957224 + ... + 1966417.

It is an arithmetic number, because the mean of its divisors is an integer number (4510226479).

Almost surely, 2^18036977677 is an apocalyptic number.

It is an amenable number.

18036977677 is a deficient number, since it is larger than the sum of its proper divisors (3928239).

18036977677 is an equidigital number, since it uses as much as digits as its factorization.

18036977677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3928238.

The product of its (nonzero) digits is 18670176, while the sum is 61.

The spelling of 18036977677 in words is "eighteen billion, thirty-six million, nine hundred seventy-seven thousand, six hundred seventy-seven".