661607567107 has 2 divisors, whose sum is σ = 661607567108. Its totient is φ = 661607567106.

The previous prime is 661607567099. The next prime is 661607567143. The reversal of 661607567107 is 701765706166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661607567107 - 2³ = 661607567099 is a prime.

It is not a weakly prime, because it can be changed into another prime (661607567147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330803783553 + 330803783554.

It is an arithmetic number, because the mean of its divisors is an integer number (330803783554).

Almost surely, 2^661607567107 is an apocalyptic number.

661607567107 is a deficient number, since it is larger than the sum of its proper divisors (1).

661607567107 is an equidigital number, since it uses as much as digits as its factorization.

661607567107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2222640, while the sum is 52.

The spelling of 661607567107 in words is "six hundred sixty-one billion, six hundred seven million, five hundred sixty-seven thousand, one hundred seven".