1623123645 has 48 divisors (see below), whose sum is σ = 3074176896. Its totient is φ = 726422400.

The previous prime is 1623123643. The next prime is 1623123647. The reversal of 1623123645 is 5463213261.

It is an interprime number because it is at equal distance from previous prime (1623123643) and next prime (1623123647).

It is not a de Polignac number, because 1623123645 - 2¹ = 1623123643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623123643) 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 47 ways as a sum of consecutive naturals, for example, 10801 + ... + 57990.

It is an arithmetic number, because the mean of its divisors is an integer number (64045352).

Almost surely, 2^1623123645 is an apocalyptic number.

1623123645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1623123645 is a deficient number, since it is larger than the sum of its proper divisors (1451053251).

1623123645 is a wasteful number, since it uses less digits than its factorization.

1623123645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68834 (or 68823 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 1623123645 is about 40288.0086998601. The cubic root of 1623123645 is about 1175.2146630590.

The spelling of 1623123645 in words is "one billion, six hundred twenty-three million, one hundred twenty-three thousand, six hundred forty-five".