2291610065621 has 2 divisors, whose sum is σ = 2291610065622. Its totient is φ = 2291610065620.

The previous prime is 2291610065609. The next prime is 2291610065659. The reversal of 2291610065621 is 1265600161922.

2291610065621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1560285784996 + 731324280625 = 1249114^2 + 855175^2 .

It is a cyclic number.

It is not a de Polignac number, because 2291610065621 - 2⁶ = 2291610065557 is a prime.

It is a super-2 number, since 2×2291610065621² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2291610065321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1145805032810 + 1145805032811.

It is an arithmetic number, because the mean of its divisors is an integer number (1145805032811).

Almost surely, 2^{2291610065621} is an apocalyptic number.

It is an amenable number.

2291610065621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2291610065621 is an equidigital number, since it uses as much as digits as its factorization.

2291610065621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 2291610065621 in words is "two trillion, two hundred ninety-one billion, six hundred ten million, sixty-five thousand, six hundred twenty-one".