18338752641 has 16 divisors (see below), whose sum is σ = 26995933440. Its totient is φ = 10980485520.

The previous prime is 18338752639. The next prime is 18338752651. The reversal of 18338752641 is 14625783381.

It is not a de Polignac number, because 18338752641 - 2¹ = 18338752639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18338752651) 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 15 ways as a sum of consecutive naturals, for example, 3344971 + ... + 3350448.

It is an arithmetic number, because the mean of its divisors is an integer number (1687245840).

Almost surely, 2^18338752641 is an apocalyptic number.

18338752641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18338752641 is a deficient number, since it is larger than the sum of its proper divisors (8657180799).

18338752641 is a wasteful number, since it uses less digits than its factorization.

18338752641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6695516.

The product of its digits is 967680, while the sum is 48.

The spelling of 18338752641 in words is "eighteen billion, three hundred thirty-eight million, seven hundred fifty-two thousand, six hundred forty-one".