18045952781 has 8 divisors (see below), whose sum is σ = 18068252160. Its totient is φ = 18023670288.

The previous prime is 18045952777. The next prime is 18045952823. The reversal of 18045952781 is 18725954081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18045952781 - 2² = 18045952777 is a prime.

It is a super-2 number, since 2×18045952781² (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 (18045952721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4521935 + ... + 4525923.

It is an arithmetic number, because the mean of its divisors is an integer number (2258531520).

Almost surely, 2^18045952781 is an apocalyptic number.

It is an amenable number.

18045952781 is a deficient number, since it is larger than the sum of its proper divisors (22299379).

18045952781 is a wasteful number, since it uses less digits than its factorization.

18045952781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8443.

The product of its (nonzero) digits is 806400, while the sum is 50.

The spelling of 18045952781 in words is "eighteen billion, forty-five million, nine hundred fifty-two thousand, seven hundred eighty-one".