661206043 has 2 divisors, whose sum is σ = 661206044. Its totient is φ = 661206042.

The previous prime is 661206019. The next prime is 661206059. The reversal of 661206043 is 340602166.

661206043 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 661206043 - 2²⁹ = 124335131 is a prime.

It is not a weakly prime, because it can be changed into another prime (661206443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330603021 + 330603022.

It is an arithmetic number, because the mean of its divisors is an integer number (330603022).

Almost surely, 2^661206043 is an apocalyptic number.

661206043 is a deficient number, since it is larger than the sum of its proper divisors (1).

661206043 is an equidigital number, since it uses as much as digits as its factorization.

661206043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 661206043 is about 25713.9270240856. The cubic root of 661206043 is about 871.1887756641.

The spelling of 661206043 in words is "six hundred sixty-one million, two hundred six thousand, forty-three".