18261013427 has 4 divisors (see below), whose sum is σ = 18266837736. Its totient is φ = 18255189120.

The previous prime is 18261013361. The next prime is 18261013469. The reversal of 18261013427 is 72431016281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18261013427 - 2¹² = 18261009331 is a prime.

It is a super-2 number, since 2×18261013427² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18261013027) 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, 2907449 + ... + 2913722.

It is an arithmetic number, because the mean of its divisors is an integer number (4566709434).

Almost surely, 2^18261013427 is an apocalyptic number.

18261013427 is a deficient number, since it is larger than the sum of its proper divisors (5824309).

18261013427 is an equidigital number, since it uses as much as digits as its factorization.

18261013427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5824308.

The product of its (nonzero) digits is 16128, while the sum is 35.

The spelling of 18261013427 in words is "eighteen billion, two hundred sixty-one million, thirteen thousand, four hundred twenty-seven".