18401377583 has 4 divisors (see below), whose sum is σ = 19369871160. Its totient is φ = 17432884008.

The previous prime is 18401377571. The next prime is 18401377667. The reversal of 18401377583 is 38577310481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38577310481 = 37 ⋅1042630013.

It is a cyclic number.

It is not a de Polignac number, because 18401377583 - 2³⁴ = 1221508399 is a prime.

It is a super-2 number, since 2×18401377583² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18401377483) 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 in 3 ways as a sum of consecutive naturals, for example, 484246760 + ... + 484246797.

It is an arithmetic number, because the mean of its divisors is an integer number (4842467790).

Almost surely, 2^18401377583 is an apocalyptic number.

18401377583 is a deficient number, since it is larger than the sum of its proper divisors (968493577).

18401377583 is an equidigital number, since it uses as much as digits as its factorization.

18401377583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968493576.

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 18401377583 in words is "eighteen billion, four hundred one million, three hundred seventy-seven thousand, five hundred eighty-three".