18228261277 has 8 divisors (see below), whose sum is σ = 19033418880. Its totient is φ = 17424155760.

The previous prime is 18228261269. The next prime is 18228261319. The reversal of 18228261277 is 77216282281.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18228261277 - 2³ = 18228261269 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 (18228264277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227502 + ... + 297007.

It is an arithmetic number, because the mean of its divisors is an integer number (2379177360).

Almost surely, 2^18228261277 is an apocalyptic number.

It is an amenable number.

18228261277 is a deficient number, since it is larger than the sum of its proper divisors (805157603).

18228261277 is a wasteful number, since it uses less digits than its factorization.

18228261277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526043.

The product of its digits is 301056, while the sum is 46.

The spelling of 18228261277 in words is "eighteen billion, two hundred twenty-eight million, two hundred sixty-one thousand, two hundred seventy-seven".