18041719261 has 4 divisors (see below), whose sum is σ = 18053661024. Its totient is φ = 18029777500.

The previous prime is 18041719219. The next prime is 18041719273. The reversal of 18041719261 is 16291714081.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16291714081 = 51551 ⋅316031.

It is a cyclic number.

It is not a de Polignac number, because 18041719261 - 2¹³ = 18041711069 is a prime.

It is a super-2 number, since 2×18041719261² (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 (13041719261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5968615 + ... + 5971636.

It is an arithmetic number, because the mean of its divisors is an integer number (4513415256).

Almost surely, 2^18041719261 is an apocalyptic number.

It is an amenable number.

18041719261 is a deficient number, since it is larger than the sum of its proper divisors (11941763).

18041719261 is a wasteful number, since it uses less digits than its factorization.

18041719261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11941762.

The product of its (nonzero) digits is 24192, while the sum is 40.

The spelling of 18041719261 in words is "eighteen billion, forty-one million, seven hundred nineteen thousand, two hundred sixty-one".