661002019 has 2 divisors, whose sum is σ = 661002020. Its totient is φ = 661002018.

The previous prime is 661001987. The next prime is 661002029. The reversal of 661002019 is 910200166.

661002019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661002019 - 2⁵ = 661001987 is a prime.

It is a super-2 number, since 2×661002019² = 873847338244152722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 661001984 and 661002002.

It is not a weakly prime, because it can be changed into another prime (661002029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330501009 + 330501010.

It is an arithmetic number, because the mean of its divisors is an integer number (330501010).

Almost surely, 2^661002019 is an apocalyptic number.

661002019 is a deficient number, since it is larger than the sum of its proper divisors (1).

661002019 is an equidigital number, since it uses as much as digits as its factorization.

661002019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 661002019 is about 25709.9595293342. The cubic root of 661002019 is about 871.0991607826.

The spelling of 661002019 in words is "six hundred sixty-one million, two thousand, nineteen".