19530078815 has 64 divisors (see below), whose sum is σ = 27276480000. Its totient is φ = 13302931968.

The previous prime is 19530078811. The next prime is 19530078863. The reversal of 19530078815 is 51887003591.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19530078815 - 2² = 19530078811 is a prime.

It is a super-2 number, since 2×19530078815² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19530078815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19530078811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7941056 + ... + 7943514.

It is an arithmetic number, because the mean of its divisors is an integer number (426195000).

Almost surely, 2^19530078815 is an apocalyptic number.

19530078815 is a deficient number, since it is larger than the sum of its proper divisors (7746401185).

19530078815 is a wasteful number, since it uses less digits than its factorization.

19530078815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2664.

The product of its (nonzero) digits is 302400, while the sum is 47.

The spelling of 19530078815 in words is "nineteen billion, five hundred thirty million, seventy-eight thousand, eight hundred fifteen".