16512262561 has 4 divisors (see below), whose sum is σ = 17044916224. Its totient is φ = 15979608900.

The previous prime is 16512262549. The next prime is 16512262573. The reversal of 16512262561 is 16526221561.

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 an interprime number because it is at equal distance from previous prime (16512262549) and next prime (16512262573).

It is a cyclic number.

It is not a de Polignac number, because 16512262561 - 2⁷ = 16512262433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16512262561.

It is not an unprimeable number, because it can be changed into a prime (16512262541) 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, 266326785 + ... + 266326846.

It is an arithmetic number, because the mean of its divisors is an integer number (4261229056).

Almost surely, 2^16512262561 is an apocalyptic number.

It is an amenable number.

16512262561 is a deficient number, since it is larger than the sum of its proper divisors (532653663).

16512262561 is an equidigital number, since it uses as much as digits as its factorization.

16512262561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532653662.

The product of its digits is 43200, while the sum is 37.

The spelling of 16512262561 in words is "sixteen billion, five hundred twelve million, two hundred sixty-two thousand, five hundred sixty-one".