18268069477 has 4 divisors (see below), whose sum is σ = 20877793696. Its totient is φ = 15658345260.

The previous prime is 18268069439. The next prime is 18268069481. The reversal of 18268069477 is 77496086281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18268069477 - 2⁷ = 18268069349 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 (18268069487) 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, 1304862099 + ... + 1304862112.

It is an arithmetic number, because the mean of its divisors is an integer number (5219448424).

Almost surely, 2^18268069477 is an apocalyptic number.

It is an amenable number.

18268069477 is a deficient number, since it is larger than the sum of its proper divisors (2609724219).

18268069477 is an equidigital number, since it uses as much as digits as its factorization.

18268069477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2609724218.

The product of its (nonzero) digits is 8128512, while the sum is 58.

The spelling of 18268069477 in words is "eighteen billion, two hundred sixty-eight million, sixty-nine thousand, four hundred seventy-seven".