16256665261 has 4 divisors (see below), whose sum is σ = 16347484800. Its totient is φ = 16165845724.

The previous prime is 16256665231. The next prime is 16256665319.

16256665261 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16256665261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16256665231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45409501 + ... + 45409858.

It is an arithmetic number, because the mean of its divisors is an integer number (4086871200).

Almost surely, 2^16256665261 is an apocalyptic number.

It is an amenable number.

16256665261 is a deficient number, since it is larger than the sum of its proper divisors (90819539).

16256665261 is an equidigital number, since it uses as much as digits as its factorization.

16256665261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90819538.

The product of its digits is 777600, while the sum is 46.

The spelling of 16256665261 in words is "sixteen billion, two hundred fifty-six million, six hundred sixty-five thousand, two hundred sixty-one".