621682444441 has 2 divisors, whose sum is σ = 621682444442. Its totient is φ = 621682444440.

The previous prime is 621682444429. The next prime is 621682444507. The reversal of 621682444441 is 144444286126.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 531301041216 + 90381403225 = 728904^2 + 300635^2 .

It is a cyclic number.

It is not a de Polignac number, because 621682444441 - 2¹⁵ = 621682411673 is a prime.

It is a super-2 number, since 2×621682444441² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 621682444391 and 621682444400.

It is not a weakly prime, because it can be changed into another prime (621682444241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310841222220 + 310841222221.

It is an arithmetic number, because the mean of its divisors is an integer number (310841222221).

Almost surely, 2^621682444441 is an apocalyptic number.

It is an amenable number.

621682444441 is a deficient number, since it is larger than the sum of its proper divisors (1).

621682444441 is an equidigital number, since it uses as much as digits as its factorization.

621682444441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1179648, while the sum is 46.

The spelling of 621682444441 in words is "six hundred twenty-one billion, six hundred eighty-two million, four hundred forty-four thousand, four hundred forty-one".