19878590113 has 8 divisors (see below), whose sum is σ = 19951998728. Its totient is φ = 19805313024.

The previous prime is 19878590111. The next prime is 19878590177. The reversal of 19878590113 is 31109587891.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5104673809 + 14773916304 = 71447^2 + 121548^2 .

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 19878590113 - 2¹ = 19878590111 is a prime.

It is a super-2 number, since 2×19878590113² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19878590111) 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, 275245 + ... + 339877.

It is an arithmetic number, because the mean of its divisors is an integer number (2493999841).

Almost surely, 2^19878590113 is an apocalyptic number.

It is an amenable number.

19878590113 is a deficient number, since it is larger than the sum of its proper divisors (73408615).

19878590113 is an equidigital number, since it uses as much as digits as its factorization.

19878590113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65763.

The product of its (nonzero) digits is 544320, while the sum is 52.

The spelling of 19878590113 in words is "nineteen billion, eight hundred seventy-eight million, five hundred ninety thousand, one hundred thirteen".