1145256665 has 12 divisors (see below), whose sum is σ = 1598685156. Its totient is φ = 785318688.

The previous prime is 1145256613. The next prime is 1145256677. The reversal of 1145256665 is 5666525411.

It can be written as a sum of positive squares in 2 ways, for example, as 356152384 + 789104281 = 18872^2 + 28091^2 .

It is not a de Polignac number, because 1145256665 - 2¹⁶ = 1145191129 is a prime.

It is a super-2 number, since 2×1145256665² = 2623225657453844450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2337014 + ... + 2337503.

It is an arithmetic number, because the mean of its divisors is an integer number (133223763).

Almost surely, 2^1145256665 is an apocalyptic number.

It is an amenable number.

1145256665 is a deficient number, since it is larger than the sum of its proper divisors (453428491).

1145256665 is an equidigital number, since it uses as much as digits as its factorization.

1145256665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4674536 (or 4674529 counting only the distinct ones).

The product of its digits is 216000, while the sum is 41.

The square root of 1145256665 is about 33841.6409915359. The cubic root of 1145256665 is about 1046.2471210703.

The spelling of 1145256665 in words is "one billion, one hundred forty-five million, two hundred fifty-six thousand, six hundred sixty-five".