16261565534 has 4 divisors (see below), whose sum is σ = 24392348304. Its totient is φ = 8130782766.

The previous prime is 16261565513. The next prime is 16261565599. The reversal of 16261565534 is 43556516261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43556516261 = 14629 ⋅2977409.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4065391382 + ... + 4065391385.

It is an arithmetic number, because the mean of its divisors is an integer number (6098087076).

Almost surely, 2^16261565534 is an apocalyptic number.

16261565534 is a deficient number, since it is larger than the sum of its proper divisors (8130782770).

16261565534 is an equidigital number, since it uses as much as digits as its factorization.

16261565534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8130782769.

The product of its digits is 648000, while the sum is 44.

The spelling of 16261565534 in words is "sixteen billion, two hundred sixty-one million, five hundred sixty-five thousand, five hundred thirty-four".