16506146565 has 12 divisors (see below), whose sum is σ = 28610654124. Its totient is φ = 8803278144.

The previous prime is 16506146557. The next prime is 16506146603. The reversal of 16506146565 is 56564160561.

16506146565 is a `hidden beast` number, since 16 + 506 + 14 + 65 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11026890081 + 5479256484 = 105009^2 + 74022^2 .

It is not a de Polignac number, because 16506146565 - 2³ = 16506146557 is a prime.

It is a super-2 number, since 2×16506146565² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 366803257 = 16506146565 / (1 + 6 + 5 + 0 + 6 + 1 + 4 + 6 + 5 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 16506146565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 183401584 + ... + 183401673.

It is an arithmetic number, because the mean of its divisors is an integer number (2384221177).

Almost surely, 2^16506146565 is an apocalyptic number.

16506146565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16506146565 is a deficient number, since it is larger than the sum of its proper divisors (12104507559).

16506146565 is a wasteful number, since it uses less digits than its factorization.

16506146565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366803268 (or 366803265 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 45.

The spelling of 16506146565 in words is "sixteen billion, five hundred six million, one hundred forty-six thousand, five hundred sixty-five".