19115078401 has 24 divisors (see below), whose sum is σ = 20020846560. Its totient is φ = 18239800320.

The previous prime is 19115078387. The next prime is 19115078419. The reversal of 19115078401 is 10487051191.

It is a happy number.

It is not a de Polignac number, because 19115078401 - 2²⁵ = 19081523969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19115078431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30880270 + ... + 30880888.

It is an arithmetic number, because the mean of its divisors is an integer number (834201940).

Almost surely, 2^19115078401 is an apocalyptic number.

It is an amenable number.

19115078401 is a deficient number, since it is larger than the sum of its proper divisors (905768159).

19115078401 is an equidigital number, since it uses as much as digits as its factorization.

19115078401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977 (or 916 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 37.

The spelling of 19115078401 in words is "nineteen billion, one hundred fifteen million, seventy-eight thousand, four hundred one".