2065524256561 has 4 divisors (see below), whose sum is σ = 2113559704432. Its totient is φ = 2017488808692.

The previous prime is 2065524256553. The next prime is 2065524256571. The reversal of 2065524256561 is 1656524255602.

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 2065524256561 - 2³ = 2065524256553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2065524256571) 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, 24017723871 + ... + 24017723956.

It is an arithmetic number, because the mean of its divisors is an integer number (528389926108).

Almost surely, 2^{2065524256561} is an apocalyptic number.

It is an amenable number.

2065524256561 is a deficient number, since it is larger than the sum of its proper divisors (48035447871).

2065524256561 is an equidigital number, since it uses as much as digits as its factorization.

2065524256561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48035447870.

The product of its (nonzero) digits is 4320000, while the sum is 49.

The spelling of 2065524256561 in words is "two trillion, sixty-five billion, five hundred twenty-four million, two hundred fifty-six thousand, five hundred sixty-one".