16561031536875 has 320 divisors, whose sum is σ = 32717386285056. Its totient is φ = 7292944512000.

The previous prime is 16561031536871. The next prime is 16561031536879. The reversal of 16561031536875 is 57863513016561.

It is an interprime number because it is at equal distance from previous prime (16561031536871) and next prime (16561031536879).

It is not a de Polignac number, because 16561031536875 - 2² = 16561031536871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16561031536871) by changing a digit.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 10733007354 + ... + 10733008896.

Almost surely, 2^{16561031536875} is an apocalyptic number.

16561031536875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16561031536875 is a deficient number, since it is larger than the sum of its proper divisors (16156354748181).

16561031536875 is a wasteful number, since it uses less digits than its factorization.

16561031536875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884 (or 1869 counting only the distinct ones).

The product of its (nonzero) digits is 13608000, while the sum is 57.

The spelling of 16561031536875 in words is "sixteen trillion, five hundred sixty-one billion, thirty-one million, five hundred thirty-six thousand, eight hundred seventy-five".