16556407534 has 4 divisors (see below), whose sum is σ = 24834611304. Its totient is φ = 8278203766.

The previous prime is 16556407493. The next prime is 16556407573. The reversal of 16556407534 is 43570465561.

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

It is a super-2 number, since 2×16556407534² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4139101882 + ... + 4139101885.

It is an arithmetic number, because the mean of its divisors is an integer number (6208652826).

Almost surely, 2^16556407534 is an apocalyptic number.

16556407534 is a deficient number, since it is larger than the sum of its proper divisors (8278203770).

16556407534 is an equidigital number, since it uses as much as digits as its factorization.

16556407534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8278203769.

The product of its (nonzero) digits is 1512000, while the sum is 46.

The spelling of 16556407534 in words is "sixteen billion, five hundred fifty-six million, four hundred seven thousand, five hundred thirty-four".