18181547954 has 4 divisors (see below), whose sum is σ = 27272321934. Its totient is φ = 9090773976.

The previous prime is 18181547953. The next prime is 18181547977. The reversal of 18181547954 is 45974518181.

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

It can be written as a sum of positive squares in only one way, i.e., 14001278929 + 4180269025 = 118327^2 + 64655^2 .

It is a super-2 number, since 2×18181547954² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18181547896 and 18181547905.

It is not an unprimeable number, because it can be changed into a prime (18181547953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4545386987 + ... + 4545386990.

Almost surely, 2^18181547954 is an apocalyptic number.

18181547954 is a deficient number, since it is larger than the sum of its proper divisors (9090773980).

18181547954 is an equidigital number, since it uses as much as digits as its factorization.

18181547954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9090773979.

The product of its digits is 1612800, while the sum is 53.

The spelling of 18181547954 in words is "eighteen billion, one hundred eighty-one million, five hundred forty-seven thousand, nine hundred fifty-four".