1145623663 has 4 divisors (see below), whose sum is σ = 1145696440. Its totient is φ = 1145550888.

The previous prime is 1145623657. The next prime is 1145623667. The reversal of 1145623663 is 3663265411.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3663265411 = 13 ⋅281789647.

It is a cyclic number.

It is not a de Polignac number, because 1145623663 - 2²⁹ = 608752751 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 (1145623667) 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, 1845 + ... + 47902.

It is an arithmetic number, because the mean of its divisors is an integer number (286424110).

Almost surely, 2^1145623663 is an apocalyptic number.

1145623663 is a deficient number, since it is larger than the sum of its proper divisors (72777).

1145623663 is an equidigital number, since it uses as much as digits as its factorization.

1145623663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72776.

The product of its digits is 77760, while the sum is 37.

The square root of 1145623663 is about 33847.0628415524. The cubic root of 1145623663 is about 1046.3588659177.

The spelling of 1145623663 in words is "one billion, one hundred forty-five million, six hundred twenty-three thousand, six hundred sixty-three".