2256661332465 has 8 divisors (see below), whose sum is σ = 3610658131968. Its totient is φ = 1203552710640.

The previous prime is 2256661332421. The next prime is 2256661332467. The reversal of 2256661332465 is 5642331666522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2256661332465 - 2⁷ = 2256661332337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2256661332467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75222044401 + ... + 75222044430.

It is an arithmetic number, because the mean of its divisors is an integer number (451332266496).

Almost surely, 2^{2256661332465} is an apocalyptic number.

It is an amenable number.

2256661332465 is a deficient number, since it is larger than the sum of its proper divisors (1353996799503).

2256661332465 is a wasteful number, since it uses less digits than its factorization.

2256661332465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150444088839.

The product of its digits is 9331200, while the sum is 51.

Adding to 2256661332465 its reverse (5642331666522), we get a palindrome (7898992998987).

The spelling of 2256661332465 in words is "two trillion, two hundred fifty-six billion, six hundred sixty-one million, three hundred thirty-two thousand, four hundred sixty-five".