661206059 has 2 divisors, whose sum is σ = 661206060. Its totient is φ = 661206058.

The previous prime is 661206043. The next prime is 661206067. The reversal of 661206059 is 950602166.

It is a happy number.

661206059 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 661206059 - 2⁴ = 661206043 is a prime.

It is a super-2 number, since 2×661206059² = 874386904916622962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (661206019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330603029 + 330603030.

It is an arithmetic number, because the mean of its divisors is an integer number (330603030).

Almost surely, 2^661206059 is an apocalyptic number.

661206059 is a deficient number, since it is larger than the sum of its proper divisors (1).

661206059 is an equidigital number, since it uses as much as digits as its factorization.

661206059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 661206059 is about 25713.9273352011. The cubic root of 661206059 is about 871.1887826912.

The spelling of 661206059 in words is "six hundred sixty-one million, two hundred six thousand, fifty-nine".