660161501 has 2 divisors, whose sum is σ = 660161502. Its totient is φ = 660161500.

The previous prime is 660161497. The next prime is 660161503. The reversal of 660161501 is 105161066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 522122500 + 138039001 = 22850^2 + 11749^2 .

It is a cyclic number.

It is not a de Polignac number, because 660161501 - 2² = 660161497 is a prime.

Together with 660161503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660161503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330080750 + 330080751.

It is an arithmetic number, because the mean of its divisors is an integer number (330080751).

Almost surely, 2^660161501 is an apocalyptic number.

It is an amenable number.

660161501 is a deficient number, since it is larger than the sum of its proper divisors (1).

660161501 is an equidigital number, since it uses as much as digits as its factorization.

660161501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 660161501 is about 25693.6081740187. The cubic root of 660161501 is about 870.7297796195.

The spelling of 660161501 in words is "six hundred sixty million, one hundred sixty-one thousand, five hundred one".