2256646065509 has 16 divisors (see below), whose sum is σ = 2478573748224. Its totient is φ = 2037557425200.

The previous prime is 2256646065463. The next prime is 2256646065593. The reversal of 2256646065509 is 9055606466522.

It is not a de Polignac number, because 2256646065509 - 2³² = 2252351098213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2256646065209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9989 + ... + 2124474.

It is an arithmetic number, because the mean of its divisors is an integer number (154910859264).

Almost surely, 2^{2256646065509} is an apocalyptic number.

It is an amenable number.

2256646065509 is a deficient number, since it is larger than the sum of its proper divisors (221927682715).

2256646065509 is a wasteful number, since it uses less digits than its factorization.

2256646065509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135128.

The product of its (nonzero) digits is 23328000, while the sum is 56.

The spelling of 2256646065509 in words is "two trillion, two hundred fifty-six billion, six hundred forty-six million, sixty-five thousand, five hundred nine".