661362100687 has 2 divisors, whose sum is σ = 661362100688. Its totient is φ = 661362100686.

The previous prime is 661362100673. The next prime is 661362100741. The reversal of 661362100687 is 786001263166.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661362100687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661362100627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330681050343 + 330681050344.

It is an arithmetic number, because the mean of its divisors is an integer number (330681050344).

Almost surely, 2^661362100687 is an apocalyptic number.

661362100687 is a deficient number, since it is larger than the sum of its proper divisors (1).

661362100687 is an equidigital number, since it uses as much as digits as its factorization.

661362100687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 661362100687 in words is "six hundred sixty-one billion, three hundred sixty-two million, one hundred thousand, six hundred eighty-seven".