660601057 has 2 divisors, whose sum is σ = 660601058. Its totient is φ = 660601056.

The previous prime is 660601049. The next prime is 660601087. The reversal of 660601057 is 750106066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 609892416 + 50708641 = 24696^2 + 7121^2 .

It is a cyclic number.

It is not a de Polignac number, because 660601057 - 2³ = 660601049 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (660601087) 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, 330300528 + 330300529.

It is an arithmetic number, because the mean of its divisors is an integer number (330300529).

Almost surely, 2^660601057 is an apocalyptic number.

It is an amenable number.

660601057 is a deficient number, since it is larger than the sum of its proper divisors (1).

660601057 is an equidigital number, since it uses as much as digits as its factorization.

660601057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 660601057 is about 25702.1605512066. The cubic root of 660601057 is about 870.9229897074.

The spelling of 660601057 in words is "six hundred sixty million, six hundred one thousand, fifty-seven".