1622120256461 has 2 divisors, whose sum is σ = 1622120256462. Its totient is φ = 1622120256460.

The previous prime is 1622120256457. The next prime is 1622120256521. The reversal of 1622120256461 is 1646520212261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1499326780900 + 122793475561 = 1224470^2 + 350419^2 .

It is a cyclic number.

It is not a de Polignac number, because 1622120256461 - 2² = 1622120256457 is a prime.

It is a super-2 number, since 2×1622120256461² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1622120256661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811060128230 + 811060128231.

It is an arithmetic number, because the mean of its divisors is an integer number (811060128231).

Almost surely, 2^{1622120256461} is an apocalyptic number.

It is an amenable number.

1622120256461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1622120256461 is an equidigital number, since it uses as much as digits as its factorization.

1622120256461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 1622120256461 in words is "one trillion, six hundred twenty-two billion, one hundred twenty million, two hundred fifty-six thousand, four hundred sixty-one".