18740405561 has 8 divisors (see below), whose sum is σ = 19050587424. Its totient is φ = 18432756160.

The previous prime is 18740405473. The next prime is 18740405569. The reversal of 18740405561 is 16550404781.

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 18740405561 - 2¹⁰ = 18740404537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18740405569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618191 + ... + 647796.

It is an arithmetic number, because the mean of its divisors is an integer number (2381323428).

Almost surely, 2^18740405561 is an apocalyptic number.

It is an amenable number.

18740405561 is a deficient number, since it is larger than the sum of its proper divisors (310181863).

18740405561 is a wasteful number, since it uses less digits than its factorization.

18740405561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266231.

The product of its (nonzero) digits is 134400, while the sum is 41.

The spelling of 18740405561 in words is "eighteen billion, seven hundred forty million, four hundred five thousand, five hundred sixty-one".