81052025018 has 4 divisors (see below), whose sum is σ = 121578037530. Its totient is φ = 40526012508.

The previous prime is 81052024987. The next prime is 81052025051.

It is a happy number.

81052025018 is nontrivially palindromic in base 10.

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., 67227674089 + 13824350929 = 259283^2 + 117577^2 .

It is a Curzon number.

It is an unprimeable number.

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, 20263006253 + ... + 20263006256.

Almost surely, 2^81052025018 is an apocalyptic number.

81052025018 is a deficient number, since it is larger than the sum of its proper divisors (40526012512).

81052025018 is a wasteful number, since it uses less digits than its factorization.

81052025018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40526012511.

The product of its (nonzero) digits is 6400, while the sum is 32.

It can be divided in two parts, 810520 and 25018, that added together give a palindrome (835538).

The spelling of 81052025018 in words is "eighty-one billion, fifty-two million, twenty-five thousand, eighteen".