660001619 has 2 divisors, whose sum is σ = 660001620. Its totient is φ = 660001618.

The previous prime is 660001579. The next prime is 660001627. The reversal of 660001619 is 916100066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660001619 - 2¹⁶ = 659936083 is a prime.

It is a super-2 number, since 2×660001619² = 871204274165242322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 660001591 and 660001600.

It is not a weakly prime, because it can be changed into another prime (660001679) 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, 330000809 + 330000810.

It is an arithmetic number, because the mean of its divisors is an integer number (330000810).

Almost surely, 2^660001619 is an apocalyptic number.

660001619 is a deficient number, since it is larger than the sum of its proper divisors (1).

660001619 is an equidigital number, since it uses as much as digits as its factorization.

660001619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 660001619 is about 25690.4966670557. The cubic root of 660001619 is about 870.6594810342.

The spelling of 660001619 in words is "six hundred sixty million, one thousand, six hundred nineteen".