2565563101 has 4 divisors (see below), whose sum is σ = 2571277500. Its totient is φ = 2559848704.

The previous prime is 2565563053. The next prime is 2565563107. The reversal of 2565563101 is 1013655652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2256155001 + 309408100 = 47499^2 + 17590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2565563101 is a prime.

It is a super-2 number, since 2×2565563101² = 13164228050425472402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565563107) 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, 2856526 + ... + 2857423.

It is an arithmetic number, because the mean of its divisors is an integer number (642819375).

Almost surely, 2^2565563101 is an apocalyptic number.

It is an amenable number.

2565563101 is a deficient number, since it is larger than the sum of its proper divisors (5714399).

2565563101 is an equidigital number, since it uses as much as digits as its factorization.

2565563101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5714398.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 2565563101 is about 50651.3879474196. The cubic root of 2565563101 is about 1368.9709538535.

The spelling of 2565563101 in words is "two billion, five hundred sixty-five million, five hundred sixty-three thousand, one hundred one".