165940404727 has 2 divisors, whose sum is σ = 165940404728. Its totient is φ = 165940404726.

The previous prime is 165940404673. The next prime is 165940404731. The reversal of 165940404727 is 727404049561.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165940404727 - 2²³ = 165932016119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165940404797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82970202363 + 82970202364.

It is an arithmetic number, because the mean of its divisors is an integer number (82970202364).

Almost surely, 2^165940404727 is an apocalyptic number.

165940404727 is a deficient number, since it is larger than the sum of its proper divisors (1).

165940404727 is an equidigital number, since it uses as much as digits as its factorization.

165940404727 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 165940404727 in words is "one hundred sixty-five billion, nine hundred forty million, four hundred four thousand, seven hundred twenty-seven".