18405551414 has 4 divisors (see below), whose sum is σ = 27608327124. Its totient is φ = 9202775706.

The previous prime is 18405551413. The next prime is 18405551429. The reversal of 18405551414 is 41415550481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41415550481 = 40193 ⋅1030417.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18405551413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4601387852 + ... + 4601387855.

It is an arithmetic number, because the mean of its divisors is an integer number (6902081781).

Almost surely, 2^18405551414 is an apocalyptic number.

18405551414 is a deficient number, since it is larger than the sum of its proper divisors (9202775710).

18405551414 is an equidigital number, since it uses as much as digits as its factorization.

18405551414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9202775709.

The product of its (nonzero) digits is 64000, while the sum is 38.

The spelling of 18405551414 in words is "eighteen billion, four hundred five million, five hundred fifty-one thousand, four hundred fourteen".