16523477432561 has 16 divisors (see below), whose sum is σ = 18204385428288. Its totient is φ = 14872369992000.

The previous prime is 16523477432533. The next prime is 16523477432573.

It is a happy number.

16523477432561 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 16523477432561 - 2³⁸ = 16248599525617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16523477432497 and 16523477432506.

It is not an unprimeable number, because it can be changed into a prime (16523477431561) 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 15 ways as a sum of consecutive naturals, for example, 115609235 + ... + 115752071.

It is an arithmetic number, because the mean of its divisors is an integer number (1137774089268).

Almost surely, 2^{16523477432561} is an apocalyptic number.

16523477432561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16523477432561 is a deficient number, since it is larger than the sum of its proper divisors (1680907995727).

16523477432561 is a wasteful number, since it uses less digits than its factorization.

16523477432561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247072.

The product of its digits is 25401600, while the sum is 56.

The spelling of 16523477432561 in words is "sixteen trillion, five hundred twenty-three billion, four hundred seventy-seven million, four hundred thirty-two thousand, five hundred sixty-one".