18729047761 has 8 divisors (see below), whose sum is σ = 19346747904. Its totient is φ = 18112193760.

The previous prime is 18729047693. The next prime is 18729047881. The reversal of 18729047761 is 16774092781.

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 18729047761 - 2²¹ = 18726950609 is a prime.

It is a super-2 number, since 2×18729047761² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18729047699 and 18729047708.

It is not an unprimeable number, because it can be changed into a prime (18729045761) 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, 166381 + ... + 255226.

It is an arithmetic number, because the mean of its divisors is an integer number (2418343488).

Almost surely, 2^18729047761 is an apocalyptic number.

It is an amenable number.

18729047761 is a deficient number, since it is larger than the sum of its proper divisors (617700143).

18729047761 is a wasteful number, since it uses less digits than its factorization.

18729047761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423071.

The product of its (nonzero) digits is 1185408, while the sum is 52.

The spelling of 18729047761 in words is "eighteen billion, seven hundred twenty-nine million, forty-seven thousand, seven hundred sixty-one".