661546117 has 2 divisors, whose sum is σ = 661546118. Its totient is φ = 661546116.

The previous prime is 661546091. The next prime is 661546133. The reversal of 661546117 is 711645166.

661546117 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 can be written as a sum of positive squares in only one way, i.e., 446307876 + 215238241 = 21126^2 + 14671^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661546117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661546147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330773058 + 330773059.

It is an arithmetic number, because the mean of its divisors is an integer number (330773059).

Almost surely, 2^661546117 is an apocalyptic number.

It is an amenable number.

661546117 is a deficient number, since it is larger than the sum of its proper divisors (1).

661546117 is an equidigital number, since it uses as much as digits as its factorization.

661546117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 661546117 is about 25720.5388162845. The cubic root of 661546117 is about 871.3381077705.

The spelling of 661546117 in words is "six hundred sixty-one million, five hundred forty-six thousand, one hundred seventeen".