1660656164659 has 2 divisors, whose sum is σ = 1660656164660. Its totient is φ = 1660656164658.

The previous prime is 1660656164647. The next prime is 1660656164681. The reversal of 1660656164659 is 9564616560661.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (9564616560661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1660656164659 - 2³⁹ = 1110900350771 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1660656164597 and 1660656164606.

It is not a weakly prime, because it can be changed into another prime (1660656164059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830328082329 + 830328082330.

It is an arithmetic number, because the mean of its divisors is an integer number (830328082330).

Almost surely, 2^{1660656164659} is an apocalyptic number.

1660656164659 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660656164659 is an equidigital number, since it uses as much as digits as its factorization.

1660656164659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41990400, while the sum is 61.

The spelling of 1660656164659 in words is "one trillion, six hundred sixty billion, six hundred fifty-six million, one hundred sixty-four thousand, six hundred fifty-nine".