18851980100309 has 8 divisors (see below), whose sum is σ = 19502221191960. Its totient is φ = 18201750529536.

The previous prime is 18851980100237. The next prime is 18851980100381. The reversal of 18851980100309 is 90300108915881.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18851980100237) and next prime (18851980100381).

It can be written as a sum of positive squares in 4 ways, for example, as 4419047235409 + 14432932864900 = 2102153^2 + 3799070^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18851980100309 - 2⁸ = 18851980100053 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 (18851980108309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516809 + ... + 6162065.

It is an arithmetic number, because the mean of its divisors is an integer number (2437777648995).

Almost surely, 2^{18851980100309} is an apocalyptic number.

It is an amenable number.

18851980100309 is a deficient number, since it is larger than the sum of its proper divisors (650241091651).

18851980100309 is a wasteful number, since it uses less digits than its factorization.

18851980100309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5760439.

The product of its (nonzero) digits is 622080, while the sum is 53.

The spelling of 18851980100309 in words is "eighteen trillion, eight hundred fifty-one billion, nine hundred eighty million, one hundred thousand, three hundred nine".