610660400341261 has 2 divisors, whose sum is σ = 610660400341262. Its totient is φ = 610660400341260.

The previous prime is 610660400341259. The next prime is 610660400341291. The reversal of 610660400341261 is 162143004066016.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 574636168264900 + 36024232076361 = 23971570^2 + 6002019^2 .

It is a cyclic number.

It is not a de Polignac number, because 610660400341261 - 2¹ = 610660400341259 is a prime.

It is a super-2 number, since 2×610660400341261² (a number of 30 digits) contains 22 as substring.

Together with 610660400341259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (610660400341291) 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, 305330200170630 + 305330200170631.

It is an arithmetic number, because the mean of its divisors is an integer number (305330200170631).

Almost surely, 2^{610660400341261} is an apocalyptic number.

It is an amenable number.

610660400341261 is a deficient number, since it is larger than the sum of its proper divisors (1).

610660400341261 is an equidigital number, since it uses as much as digits as its factorization.

610660400341261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 610660400341261 in words is "six hundred ten trillion, six hundred sixty billion, four hundred million, three hundred forty-one thousand, two hundred sixty-one".