19881057893 has 8 divisors (see below), whose sum is σ = 20421259128. Its totient is φ = 19341008064.

The previous prime is 19881057887. The next prime is 19881057961. The reversal of 19881057893 is 39875018891.

It can be written as a sum of positive squares in 4 ways, for example, as 5994320929 + 13886736964 = 77423^2 + 117842^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 19881057893 - 2¹⁶ = 19880992357 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 (19881057803) 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, 259655 + ... + 327387.

It is an arithmetic number, because the mean of its divisors is an integer number (2552657391).

Almost surely, 2^19881057893 is an apocalyptic number.

It is an amenable number.

19881057893 is a deficient number, since it is larger than the sum of its proper divisors (540201235).

19881057893 is an equidigital number, since it uses as much as digits as its factorization.

19881057893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75703.

The product of its (nonzero) digits is 4354560, while the sum is 59.

The spelling of 19881057893 in words is "nineteen billion, eight hundred eighty-one million, fifty-seven thousand, eight hundred ninety-three".