18406755738 has 56 divisors (see below), whose sum is σ = 47310041568. Its totient is φ = 5259070152.

The previous prime is 18406755737. The next prime is 18406755739. The reversal of 18406755738 is 83755760481.

It is a happy number.

18406755738 is a `hidden beast` number, since 1 + 8 + 4 + 0 + 67 + 5 + 573 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (18406755737) and next prime (18406755739).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18406755733) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 891556 + ... + 911967.

Almost surely, 2^18406755738 is an apocalyptic number.

18406755738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18406755738 is an abundant number, since it is smaller than the sum of its proper divisors (28903285830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18406755738 is an equidigital number, since it uses as much as digits as its factorization.

18406755738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1803550 (or 1803535 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 54.

The spelling of 18406755738 in words is "eighteen billion, four hundred six million, seven hundred fifty-five thousand, seven hundred thirty-eight".