610666601557 has 2 divisors, whose sum is σ = 610666601558. Its totient is φ = 610666601556.

The previous prime is 610666601543. The next prime is 610666601581. The reversal of 610666601557 is 755106666016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 384432240676 + 226234360881 = 620026^2 + 475641^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-610666601557 is a prime.

It is a super-3 number, since 3×610666601557³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 610666601557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (610666601057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305333300778 + 305333300779.

It is an arithmetic number, because the mean of its divisors is an integer number (305333300779).

Almost surely, 2^610666601557 is an apocalyptic number.

It is an amenable number.

610666601557 is a deficient number, since it is larger than the sum of its proper divisors (1).

610666601557 is an equidigital number, since it uses as much as digits as its factorization.

610666601557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 610666601557 in words is "six hundred ten billion, six hundred sixty-six million, six hundred one thousand, five hundred fifty-seven".