16500977291887 has 4 divisors (see below), whose sum is σ = 18001066136616. Its totient is φ = 15000888447160.

The previous prime is 16500977291881. The next prime is 16500977291957. The reversal of 16500977291887 is 78819277900561.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16500977291887 - 2³ = 16500977291879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16500977291881) 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, 750044422348 + ... + 750044422369.

It is an arithmetic number, because the mean of its divisors is an integer number (4500266534154).

Almost surely, 2^{16500977291887} is an apocalyptic number.

16500977291887 is a deficient number, since it is larger than the sum of its proper divisors (1500088844729).

16500977291887 is a wasteful number, since it uses less digits than its factorization.

16500977291887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500088844728.

The product of its (nonzero) digits is 106686720, while the sum is 70.

The spelling of 16500977291887 in words is "sixteen trillion, five hundred billion, nine hundred seventy-seven million, two hundred ninety-one thousand, eight hundred eighty-seven".