621044501453161 has 2 divisors, whose sum is σ = 621044501453162. Its totient is φ = 621044501453160.

The previous prime is 621044501453141. The next prime is 621044501453171. The reversal of 621044501453161 is 161354105440126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 552220155403225 + 68824346049936 = 23499365^2 + 8296044^2 .

It is a cyclic number.

It is not a de Polignac number, because 621044501453161 - 2¹¹ = 621044501451113 is a prime.

It is not a weakly prime, because it can be changed into another prime (621044501453141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310522250726580 + 310522250726581.

It is an arithmetic number, because the mean of its divisors is an integer number (310522250726581).

Almost surely, 2^{621044501453161} is an apocalyptic number.

It is an amenable number.

621044501453161 is a deficient number, since it is larger than the sum of its proper divisors (1).

621044501453161 is an equidigital number, since it uses as much as digits as its factorization.

621044501453161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 43.

Adding to 621044501453161 its reverse (161354105440126), we get a palindrome (782398606893287).

The spelling of 621044501453161 in words is "six hundred twenty-one trillion, forty-four billion, five hundred one million, four hundred fifty-three thousand, one hundred sixty-one".