18501606001 has 4 divisors (see below), whose sum is σ = 18931875952. Its totient is φ = 18071336052.

The previous prime is 18501605987. The next prime is 18501606007. The reversal of 18501606001 is 10060610581.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10060610581 = 7 ⋅1437230083.

It is a cyclic number.

It is not a de Polignac number, because 18501606001 - 2⁷ = 18501605873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18501606007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215134911 + ... + 215134996.

It is an arithmetic number, because the mean of its divisors is an integer number (4732968988).

Almost surely, 2^18501606001 is an apocalyptic number.

It is an amenable number.

18501606001 is a deficient number, since it is larger than the sum of its proper divisors (430269951).

18501606001 is an equidigital number, since it uses as much as digits as its factorization.

18501606001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430269950.

The product of its (nonzero) digits is 1440, while the sum is 28.

The spelling of 18501606001 in words is "eighteen billion, five hundred one million, six hundred six thousand, one".