1623552621255 has 16 divisors (see below), whose sum is σ = 2886315771360. Its totient is φ = 865894731264.

The previous prime is 1623552621253. The next prime is 1623552621283. The reversal of 1623552621255 is 5521262553261.

1623552621255 is a `hidden beast` number, since 1 + 6 + 2 + 355 + 26 + 21 + 255 = 666.

It is not a de Polignac number, because 1623552621255 - 2¹ = 1623552621253 is a prime.

It is a super-2 number, since 2×1623552621255² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1623552621255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623552621253) 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, 6013157722 + ... + 6013157991.

It is an arithmetic number, because the mean of its divisors is an integer number (180394735710).

Almost surely, 2^{1623552621255} is an apocalyptic number.

1623552621255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1623552621255 is a deficient number, since it is larger than the sum of its proper divisors (1262763150105).

1623552621255 is a wasteful number, since it uses less digits than its factorization.

1623552621255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12026315727 (or 12026315721 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 45.

The spelling of 1623552621255 in words is "one trillion, six hundred twenty-three billion, five hundred fifty-two million, six hundred twenty-one thousand, two hundred fifty-five".