165940404673 has 2 divisors, whose sum is σ = 165940404674. Its totient is φ = 165940404672.

The previous prime is 165940404631. The next prime is 165940404727. The reversal of 165940404673 is 376404049561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164427817009 + 1512587664 = 405497^2 + 38892^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165940404673 is a prime.

It is not a weakly prime, because it can be changed into another prime (165940404173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82970202336 + 82970202337.

It is an arithmetic number, because the mean of its divisors is an integer number (82970202337).

Almost surely, 2^165940404673 is an apocalyptic number.

It is an amenable number.

165940404673 is a deficient number, since it is larger than the sum of its proper divisors (1).

165940404673 is an equidigital number, since it uses as much as digits as its factorization.

165940404673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 49.

The spelling of 165940404673 in words is "one hundred sixty-five billion, nine hundred forty million, four hundred four thousand, six hundred seventy-three".