19766987449 has 8 divisors (see below), whose sum is σ = 21836949120. Its totient is φ = 17742519600.

The previous prime is 19766987441. The next prime is 19766987501. The reversal of 19766987449 is 94478966791.

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 19766987449 - 2³ = 19766987441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19766987441) 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, 11372542 + ... + 11374279.

It is an arithmetic number, because the mean of its divisors is an integer number (2729618640).

Almost surely, 2^19766987449 is an apocalyptic number.

It is an amenable number.

19766987449 is a deficient number, since it is larger than the sum of its proper divisors (2069961671).

19766987449 is a wasteful number, since it uses less digits than its factorization.

19766987449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22746911.

The product of its digits is 164602368, while the sum is 70.

The spelling of 19766987449 in words is "nineteen billion, seven hundred sixty-six million, nine hundred eighty-seven thousand, four hundred forty-nine".