18147385729 has 8 divisors (see below), whose sum is σ = 19798123680. Its totient is φ = 16496810400.

The previous prime is 18147385723. The next prime is 18147385801. The reversal of 18147385729 is 92758374181.

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 18147385729 - 2³ = 18147385721 is a prime.

It is a super-2 number, since 2×18147385729² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18147385729.

It is not an unprimeable number, because it can be changed into a prime (18147385721) 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, 408069 + ... + 450349.

It is an arithmetic number, because the mean of its divisors is an integer number (2474765460).

Almost surely, 2^18147385729 is an apocalyptic number.

It is an amenable number.

18147385729 is a deficient number, since it is larger than the sum of its proper divisors (1650737951).

18147385729 is a wasteful number, since it uses less digits than its factorization.

18147385729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81311.

The product of its digits is 3386880, while the sum is 55.

The spelling of 18147385729 in words is "eighteen billion, one hundred forty-seven million, three hundred eighty-five thousand, seven hundred twenty-nine".