1253323665 has 64 divisors (see below), whose sum is σ = 2443841280. Its totient is φ = 604385280.

The previous prime is 1253323661. The next prime is 1253323679. The reversal of 1253323665 is 5663233521.

It is not a de Polignac number, because 1253323665 - 2² = 1253323661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1253323661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 284419 + ... + 288791.

It is an arithmetic number, because the mean of its divisors is an integer number (38185020).

Almost surely, 2^1253323665 is an apocalyptic number.

1253323665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1253323665 is a deficient number, since it is larger than the sum of its proper divisors (1190517615).

1253323665 is a wasteful number, since it uses less digits than its factorization.

1253323665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4591 (or 4585 counting only the distinct ones).

The product of its digits is 97200, while the sum is 36.

The square root of 1253323665 is about 35402.3115770708. The cubic root of 1253323665 is about 1078.1712492825.

The spelling of 1253323665 in words is "one billion, two hundred fifty-three million, three hundred twenty-three thousand, six hundred sixty-five".