621242544356613 has 32 divisors (see below), whose sum is σ = 929658294739200. Its totient is φ = 409980305020608.

The previous prime is 621242544356593. The next prime is 621242544356657. The reversal of 621242544356613 is 316653445242126.

621242544356613 is a `hidden beast` number, since 6 + 2 + 1 + 2 + 4 + 2 + 544 + 35 + 6 + 61 + 3 = 666.

It is not a de Polignac number, because 621242544356613 - 2²¹ = 621242542259461 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 621242544356613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621242544356683) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36570678 + ... + 50792711.

It is an arithmetic number, because the mean of its divisors is an integer number (29051821710600).

Almost surely, 2^{621242544356613} is an apocalyptic number.

It is an amenable number.

621242544356613 is a deficient number, since it is larger than the sum of its proper divisors (308415750382587).

621242544356613 is a wasteful number, since it uses less digits than its factorization.

621242544356613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87366058 (or 87366052 counting only the distinct ones).

The product of its digits is 24883200, while the sum is 54.

Adding to 621242544356613 its reverse (316653445242126), we get a palindrome (937895989598739).

The spelling of 621242544356613 in words is "six hundred twenty-one trillion, two hundred forty-two billion, five hundred forty-four million, three hundred fifty-six thousand, six hundred thirteen".