1623255621 has 16 divisors (see below), whose sum is σ = 2334049536. Its totient is φ = 997546176.

The previous prime is 1623255611. The next prime is 1623255637. The reversal of 1623255621 is 1265523261.

It is not a de Polignac number, because 1623255621 - 2⁷ = 1623255493 is a prime.

It is a super-2 number, since 2×1623255621² = 5269917622216191282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623255611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196 + ... + 56978.

It is an arithmetic number, because the mean of its divisors is an integer number (145878096).

Almost surely, 2^1623255621 is an apocalyptic number.

It is an amenable number.

1623255621 is a deficient number, since it is larger than the sum of its proper divisors (710793915).

1623255621 is a wasteful number, since it uses less digits than its factorization.

1623255621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57532.

The product of its digits is 21600, while the sum is 33.

The square root of 1623255621 is about 40289.6465732823. The cubic root of 1623255621 is about 1175.2465143861.

Adding to 1623255621 its reverse (1265523261), we get a palindrome (2888778882).

The spelling of 1623255621 in words is "one billion, six hundred twenty-three million, two hundred fifty-five thousand, six hundred twenty-one".