1223745645 has 8 divisors (see below), whose sum is σ = 1957993056. Its totient is φ = 652664336.

The previous prime is 1223745637. The next prime is 1223745671. The reversal of 1223745645 is 5465473221.

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 1223745645 - 2³ = 1223745637 is a prime.

It is a super-3 number, since 3×1223745645³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40791507 + ... + 40791536.

It is an arithmetic number, because the mean of its divisors is an integer number (244749132).

Almost surely, 2^1223745645 is an apocalyptic number.

1223745645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1223745645 is a deficient number, since it is larger than the sum of its proper divisors (734247411).

1223745645 is an equidigital number, since it uses as much as digits as its factorization.

1223745645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81583051.

The product of its digits is 201600, while the sum is 39.

The square root of 1223745645 is about 34982.0760533162. The cubic root of 1223745645 is about 1069.6221465490.

The spelling of 1223745645 in words is "one billion, two hundred twenty-three million, seven hundred forty-five thousand, six hundred forty-five".