5461222221661 has 2 divisors, whose sum is σ = 5461222221662. Its totient is φ = 5461222221660.

The previous prime is 5461222221617. The next prime is 5461222221667. The reversal of 5461222221661 is 1661222221645.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4781700624100 + 679521597561 = 2186710^2 + 824331^2 .

It is a cyclic number.

It is not a de Polignac number, because 5461222221661 - 2²⁵ = 5461188667229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5461222221667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2730611110830 + 2730611110831.

It is an arithmetic number, because the mean of its divisors is an integer number (2730611110831).

Almost surely, 2^{5461222221661} is an apocalyptic number.

It is an amenable number.

5461222221661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5461222221661 is an equidigital number, since it uses as much as digits as its factorization.

5461222221661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 40.

The spelling of 5461222221661 in words is "five trillion, four hundred sixty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, six hundred sixty-one".