2160256463561 has 4 divisors (see below), whose sum is σ = 2468864529792. Its totient is φ = 1851648397332.

The previous prime is 2160256463549. The next prime is 2160256463569. The reversal of 2160256463561 is 1653646520612.

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 not a de Polignac number, because 2160256463561 - 2²² = 2160252269257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2160256463569) 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, 154304033105 + ... + 154304033118.

It is an arithmetic number, because the mean of its divisors is an integer number (617216132448).

Almost surely, 2^{2160256463561} is an apocalyptic number.

It is an amenable number.

2160256463561 is a deficient number, since it is larger than the sum of its proper divisors (308608066231).

2160256463561 is an equidigital number, since it uses as much as digits as its factorization.

2160256463561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308608066230.

The product of its (nonzero) digits is 1555200, while the sum is 47.

The spelling of 2160256463561 in words is "two trillion, one hundred sixty billion, two hundred fifty-six million, four hundred sixty-three thousand, five hundred sixty-one".