661180339 has 2 divisors, whose sum is σ = 661180340. Its totient is φ = 661180338.

The previous prime is 661180319. The next prime is 661180357. The reversal of 661180339 is 933081166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661180339 - 2²³ = 652791731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661180298 and 661180307.

It is not a weakly prime, because it can be changed into another prime (661180319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330590169 + 330590170.

It is an arithmetic number, because the mean of its divisors is an integer number (330590170).

Almost surely, 2^661180339 is an apocalyptic number.

661180339 is a deficient number, since it is larger than the sum of its proper divisors (1).

661180339 is an equidigital number, since it uses as much as digits as its factorization.

661180339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 661180339 is about 25713.4272122562. The cubic root of 661180339 is about 871.1774865323.

The spelling of 661180339 in words is "six hundred sixty-one million, one hundred eighty thousand, three hundred thirty-nine".