165042407 has 2 divisors, whose sum is σ = 165042408. Its totient is φ = 165042406.

The previous prime is 165042391. The next prime is 165042421. The reversal of 165042407 is 704240561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165042407 - 2⁴ = 165042391 is a prime.

It is a super-2 number, since 2×165042407² = 54477992216707298, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 165042407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165042107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82521203 + 82521204.

It is an arithmetic number, because the mean of its divisors is an integer number (82521204).

Almost surely, 2^165042407 is an apocalyptic number.

165042407 is a deficient number, since it is larger than the sum of its proper divisors (1).

165042407 is an equidigital number, since it uses as much as digits as its factorization.

165042407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 165042407 is about 12846.8831628532. The cubic root of 165042407 is about 548.5276399438.

Adding to 165042407 its reverse (704240561), we get a palindrome (869282968).

The spelling of 165042407 in words is "one hundred sixty-five million, forty-two thousand, four hundred seven".