661318655083 has 2 divisors, whose sum is σ = 661318655084. Its totient is φ = 661318655082.

The previous prime is 661318655033. The next prime is 661318655099. The reversal of 661318655083 is 380556813166.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661318655083 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661318655083.

It is not a weakly prime, because it can be changed into another prime (661318655003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330659327541 + 330659327542.

It is an arithmetic number, because the mean of its divisors is an integer number (330659327542).

Almost surely, 2^661318655083 is an apocalyptic number.

661318655083 is a deficient number, since it is larger than the sum of its proper divisors (1).

661318655083 is an equidigital number, since it uses as much as digits as its factorization.

661318655083 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3110400, while the sum is 52.

The spelling of 661318655083 in words is "six hundred sixty-one billion, three hundred eighteen million, six hundred fifty-five thousand, eighty-three".