660120619 has 2 divisors, whose sum is σ = 660120620. Its totient is φ = 660120618.

The previous prime is 660120581. The next prime is 660120641. The reversal of 660120619 is 916021066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660120619 - 2⁷ = 660120491 is a prime.

It is a super-2 number, since 2×660120619² = 871518463257886322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (660120689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330060309 + 330060310.

It is an arithmetic number, because the mean of its divisors is an integer number (330060310).

Almost surely, 2^660120619 is an apocalyptic number.

660120619 is a deficient number, since it is larger than the sum of its proper divisors (1).

660120619 is an equidigital number, since it uses as much as digits as its factorization.

660120619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 660120619 is about 25692.8125941867. The cubic root of 660120619 is about 870.7118052755.

The spelling of 660120619 in words is "six hundred sixty million, one hundred twenty thousand, six hundred nineteen".