18620432248989 has 4 divisors (see below), whose sum is σ = 24827242998656. Its totient is φ = 12413621499324.

The previous prime is 18620432248967. The next prime is 18620432249051. The reversal of 18620432248989 is 98984223402681.

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 not a de Polignac number, because 18620432248989 - 2¹³ = 18620432240797 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 (18620432248919) 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, 3103405374829 + ... + 3103405374834.

It is an arithmetic number, because the mean of its divisors is an integer number (6206810749664).

Almost surely, 2^{18620432248989} is an apocalyptic number.

It is an amenable number.

18620432248989 is a deficient number, since it is larger than the sum of its proper divisors (6206810749667).

18620432248989 is an equidigital number, since it uses as much as digits as its factorization.

18620432248989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6206810749666.

The product of its (nonzero) digits is 95551488, while the sum is 66.

The spelling of 18620432248989 in words is "eighteen trillion, six hundred twenty billion, four hundred thirty-two million, two hundred forty-eight thousand, nine hundred eighty-nine".