18461754581 has 4 divisors (see below), whose sum is σ = 18462149664. Its totient is φ = 18461359500.

The previous prime is 18461754541. The next prime is 18461754587. The reversal of 18461754581 is 18545716481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18461754581 is a prime.

It is a super-2 number, since 2×18461754581² (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 (18461754587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116315 + ... + 224616.

It is an arithmetic number, because the mean of its divisors is an integer number (4615537416).

Almost surely, 2^18461754581 is an apocalyptic number.

It is an amenable number.

18461754581 is a deficient number, since it is larger than the sum of its proper divisors (395083).

18461754581 is an equidigital number, since it uses as much as digits as its factorization.

18461754581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395082.

The product of its digits is 1075200, while the sum is 50.

The spelling of 18461754581 in words is "eighteen billion, four hundred sixty-one million, seven hundred fifty-four thousand, five hundred eighty-one".