18164621530 has 64 divisors (see below), whose sum is σ = 35953632000. Its totient is φ = 6552760320.

The previous prime is 18164621507. The next prime is 18164621539. The reversal of 18164621530 is 3512646181.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18164621530.

It is not an unprimeable number, because it can be changed into a prime (18164621539) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9318996 + ... + 9320944.

It is an arithmetic number, because the mean of its divisors is an integer number (561775500).

Almost surely, 2^18164621530 is an apocalyptic number.

18164621530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18164621530 is a deficient number, since it is larger than the sum of its proper divisors (17789010470).

18164621530 is a wasteful number, since it uses less digits than its factorization.

18164621530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2599.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 18164621530 in words is "eighteen billion, one hundred sixty-four million, six hundred twenty-one thousand, five hundred thirty".