18351685001801 has 4 divisors (see below), whose sum is σ = 18351703851792. Its totient is φ = 18351666151812.

The previous prime is 18351685001761. The next prime is 18351685001809. The reversal of 18351685001801 is 10810058615381.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 18351685001801 - 2³⁴ = 18334505132617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18351685001809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7880255 + ... + 9939908.

It is an arithmetic number, because the mean of its divisors is an integer number (4587925962948).

Almost surely, 2^{18351685001801} is an apocalyptic number.

It is an amenable number.

18351685001801 is a deficient number, since it is larger than the sum of its proper divisors (18849991).

18351685001801 is a wasteful number, since it uses less digits than its factorization.

18351685001801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18849990.

The product of its (nonzero) digits is 230400, while the sum is 47.

The spelling of 18351685001801 in words is "eighteen trillion, three hundred fifty-one billion, six hundred eighty-five million, one thousand, eight hundred one".