610666601581 has 2 divisors, whose sum is σ = 610666601582. Its totient is φ = 610666601580.

The previous prime is 610666601557. The next prime is 610666601591. The reversal of 610666601581 is 185106666016.

610666601581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 534603719556 + 76062882025 = 731166^2 + 275795^2 .

It is a cyclic number.

It is not a de Polignac number, because 610666601581 - 2¹¹ = 610666599533 is a prime.

It is a super-2 number, since 2×610666601581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (610666601591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305333300790 + 305333300791.

It is an arithmetic number, because the mean of its divisors is an integer number (305333300791).

Almost surely, 2^610666601581 is an apocalyptic number.

It is an amenable number.

610666601581 is a deficient number, since it is larger than the sum of its proper divisors (1).

610666601581 is an equidigital number, since it uses as much as digits as its factorization.

610666601581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 610666601581 in words is "six hundred ten billion, six hundred sixty-six million, six hundred one thousand, five hundred eighty-one".