1223665523 has 8 divisors (see below), whose sum is σ = 1246015680. Its totient is φ = 1201487040.

The previous prime is 1223665489. The next prime is 1223665543. The reversal of 1223665523 is 3255663221.

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

It is a cyclic number.

It is not a de Polignac number, because 1223665523 - 2²⁴ = 1206888307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223665543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28490 + ... + 57087.

It is an arithmetic number, because the mean of its divisors is an integer number (155751960).

Almost surely, 2^1223665523 is an apocalyptic number.

1223665523 is a deficient number, since it is larger than the sum of its proper divisors (22350157).

1223665523 is an equidigital number, since it uses as much as digits as its factorization.

1223665523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85837.

The product of its digits is 64800, while the sum is 35.

The square root of 1223665523 is about 34980.9308481064. The cubic root of 1223665523 is about 1069.5988023363.

The spelling of 1223665523 in words is "one billion, two hundred twenty-three million, six hundred sixty-five thousand, five hundred twenty-three".