16525487161 has 4 divisors (see below), whose sum is σ = 17058567424. Its totient is φ = 15992406900.

The previous prime is 16525487149. The next prime is 16525487197. The reversal of 16525487161 is 16178452561.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16178452561 = 2843 ⋅5690627.

It is a cyclic number.

It is not a de Polignac number, because 16525487161 - 2²⁵ = 16491932729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16525487141) 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, 266540085 + ... + 266540146.

It is an arithmetic number, because the mean of its divisors is an integer number (4264641856).

Almost surely, 2^16525487161 is an apocalyptic number.

It is an amenable number.

16525487161 is a deficient number, since it is larger than the sum of its proper divisors (533080263).

16525487161 is an equidigital number, since it uses as much as digits as its factorization.

16525487161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533080262.

The product of its digits is 403200, while the sum is 46.

The spelling of 16525487161 in words is "sixteen billion, five hundred twenty-five million, four hundred eighty-seven thousand, one hundred sixty-one".