660349057 has 2 divisors, whose sum is σ = 660349058. Its totient is φ = 660349056.

The previous prime is 660349049. The next prime is 660349103. The reversal of 660349057 is 750943066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 655155216 + 5193841 = 25596^2 + 2279^2 .

It is a cyclic number.

It is not a de Polignac number, because 660349057 - 2³ = 660349049 is a prime.

It is not a weakly prime, because it can be changed into another prime (660349007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330174528 + 330174529.

It is an arithmetic number, because the mean of its divisors is an integer number (330174529).

Almost surely, 2^660349057 is an apocalyptic number.

It is an amenable number.

660349057 is a deficient number, since it is larger than the sum of its proper divisors (1).

660349057 is an equidigital number, since it uses as much as digits as its factorization.

660349057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 660349057 is about 25697.2577719880. The cubic root of 660349057 is about 870.8122317320.

The spelling of 660349057 in words is "six hundred sixty million, three hundred forty-nine thousand, fifty-seven".