19976915827 has 4 divisors (see below), whose sum is σ = 21792999096. Its totient is φ = 18160832560.

The previous prime is 19976915821. The next prime is 19976915851. The reversal of 19976915827 is 72851967991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72851967991 = 11 ⋅6622906181.

It is a cyclic number.

It is not a de Polignac number, because 19976915827 - 2²³ = 19968527219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19976915821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 908041618 + ... + 908041639.

It is an arithmetic number, because the mean of its divisors is an integer number (5448249774).

Almost surely, 2^19976915827 is an apocalyptic number.

19976915827 is a deficient number, since it is larger than the sum of its proper divisors (1816083269).

19976915827 is a wasteful number, since it uses less digits than its factorization.

19976915827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816083268.

The product of its digits is 17146080, while the sum is 64.

The spelling of 19976915827 in words is "nineteen billion, nine hundred seventy-six million, nine hundred fifteen thousand, eight hundred twenty-seven".