80018621 has 4 divisors (see below), whose sum is σ = 80036544. Its totient is φ = 80000700.

The previous prime is 80018611. The next prime is 80018639. The reversal of 80018621 is 12681008.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80018621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80018611) 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, 3686 + ... + 13176.

It is an arithmetic number, because the mean of its divisors is an integer number (20009136).

Almost surely, 2^80018621 is an apocalyptic number.

It is an amenable number.

80018621 is a deficient number, since it is larger than the sum of its proper divisors (17923).

80018621 is an equidigital number, since it uses as much as digits as its factorization.

80018621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17922.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 80018621 is about 8945.3127949782. The cubic root of 80018621 is about 430.9203668532.

Adding to 80018621 its reverse (12681008), we get a palindrome (92699629).

The spelling of 80018621 in words is "eighty million, eighteen thousand, six hundred twenty-one".