16428887752509 has 16 divisors (see below), whose sum is σ = 24339614783040. Its totient is φ = 10952357017680.

The previous prime is 16428887752471. The next prime is 16428887752517. The reversal of 16428887752509 is 90525778882461.

16428887752509 is a `hidden beast` number, since 1 + 6 + 4 + 28 + 8 + 8 + 77 + 525 + 0 + 9 = 666.

It is not a de Polignac number, because 16428887752509 - 2¹¹ = 16428887750461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16428887752549) 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, 5235402 + ... + 7763195.

It is an arithmetic number, because the mean of its divisors is an integer number (1521225923940).

Almost surely, 2^{16428887752509} is an apocalyptic number.

It is an amenable number.

16428887752509 is a deficient number, since it is larger than the sum of its proper divisors (7910727030531).

16428887752509 is a wasteful number, since it uses less digits than its factorization.

16428887752509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13045417 (or 13045411 counting only the distinct ones).

The product of its (nonzero) digits is 541900800, while the sum is 72.

The spelling of 16428887752509 in words is "sixteen trillion, four hundred twenty-eight billion, eight hundred eighty-seven million, seven hundred fifty-two thousand, five hundred nine".