19889252977 has 8 divisors (see below), whose sum is σ = 21715447392. Its totient is φ = 18066072000.

The previous prime is 19889252963. The next prime is 19889253001. The reversal of 19889252977 is 77925298891.

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 19889252977 - 2³¹ = 17741769329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19889252917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 739543 + ... + 765964.

It is an arithmetic number, because the mean of its divisors is an integer number (2714430924).

Almost surely, 2^19889252977 is an apocalyptic number.

It is an amenable number.

19889252977 is a deficient number, since it is larger than the sum of its proper divisors (1826194415).

19889252977 is a wasteful number, since it uses less digits than its factorization.

19889252977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506719.

The product of its digits is 45722880, while the sum is 67.

The spelling of 19889252977 in words is "nineteen billion, eight hundred eighty-nine million, two hundred fifty-two thousand, nine hundred seventy-seven".