19870515245 has 16 divisors (see below), whose sum is σ = 27501006720. Its totient is φ = 13500489024.

The previous prime is 19870515241. The next prime is 19870515271. The reversal of 19870515245 is 54251507891.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19870515245 - 2² = 19870515241 is a prime.

It is a super-2 number, since 2×19870515245² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 19870515245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19870515241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2600447 + ... + 2608076.

It is an arithmetic number, because the mean of its divisors is an integer number (1718812920).

Almost surely, 2^19870515245 is an apocalyptic number.

It is an amenable number.

19870515245 is a deficient number, since it is larger than the sum of its proper divisors (7630491475).

19870515245 is a wasteful number, since it uses less digits than its factorization.

19870515245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5208644.

The product of its (nonzero) digits is 504000, while the sum is 47.

The spelling of 19870515245 in words is "nineteen billion, eight hundred seventy million, five hundred fifteen thousand, two hundred forty-five".