2256016781461 has 2 divisors, whose sum is σ = 2256016781462. Its totient is φ = 2256016781460.

The previous prime is 2256016781419. The next prime is 2256016781651. The reversal of 2256016781461 is 1641876106522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1558927044900 + 697089736561 = 1248570^2 + 834919^2 .

It is a cyclic number.

It is not a de Polignac number, because 2256016781461 - 2⁹ = 2256016780949 is a prime.

It is a super-2 number, since 2×2256016781461² (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 (2256016781861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1128008390730 + 1128008390731.

It is an arithmetic number, because the mean of its divisors is an integer number (1128008390731).

Almost surely, 2^{2256016781461} is an apocalyptic number.

It is an amenable number.

2256016781461 is a deficient number, since it is larger than the sum of its proper divisors (1).

2256016781461 is an equidigital number, since it uses as much as digits as its factorization.

2256016781461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 2256016781461 in words is "two trillion, two hundred fifty-six billion, sixteen million, seven hundred eighty-one thousand, four hundred sixty-one".