660671101549 has 2 divisors, whose sum is σ = 660671101550. Its totient is φ = 660671101548.

The previous prime is 660671101543. The next prime is 660671101553. The reversal of 660671101549 is 945101176066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 653701356324 + 6969745225 = 808518^2 + 83485^2 .

It is a cyclic number.

It is not a de Polignac number, because 660671101549 - 2⁷ = 660671101421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 660671101499 and 660671101508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660671101543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330335550774 + 330335550775.

It is an arithmetic number, because the mean of its divisors is an integer number (330335550775).

Almost surely, 2^660671101549 is an apocalyptic number.

It is an amenable number.

660671101549 is a deficient number, since it is larger than the sum of its proper divisors (1).

660671101549 is an equidigital number, since it uses as much as digits as its factorization.

660671101549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 660671101549 in words is "six hundred sixty billion, six hundred seventy-one million, one hundred one thousand, five hundred forty-nine".