18550057 has 4 divisors (see below), whose sum is σ = 18558676. Its totient is φ = 18541440.

The previous prime is 18550033. The next prime is 18550067. The reversal of 18550057 is 75005581.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 12809241 + 5740816 = 3579^2 + 2396^2 .

It is a cyclic number.

It is not a de Polignac number, because 18550057 - 2⁷ = 18549929 is a prime.

It is a super-2 number, since 2×18550057² = 688209229406498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18550067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1957 + ... + 6397.

It is an arithmetic number, because the mean of its divisors is an integer number (4639669).

Almost surely, 2^18550057 is an apocalyptic number.

It is an amenable number.

18550057 is a deficient number, since it is larger than the sum of its proper divisors (8619).

18550057 is an equidigital number, since it uses as much as digits as its factorization.

18550057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8618.

The product of its (nonzero) digits is 7000, while the sum is 31.

The square root of 18550057 is about 4306.9777106458. The cubic root of 18550057 is about 264.7169494681.

The spelling of 18550057 in words is "eighteen million, five hundred fifty thousand, fifty-seven".