165399547 has 2 divisors, whose sum is σ = 165399548. Its totient is φ = 165399546.

The previous prime is 165399517. The next prime is 165399551. The reversal of 165399547 is 745993561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165399547 - 2⁷ = 165399419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165399547.

It is not a weakly prime, because it can be changed into another prime (165399517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82699773 + 82699774.

It is an arithmetic number, because the mean of its divisors is an integer number (82699774).

Almost surely, 2^165399547 is an apocalyptic number.

165399547 is a deficient number, since it is larger than the sum of its proper divisors (1).

165399547 is an equidigital number, since it uses as much as digits as its factorization.

165399547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1020600, while the sum is 49.

The square root of 165399547 is about 12860.7755209396. The cubic root of 165399547 is about 548.9230131273.

The spelling of 165399547 in words is "one hundred sixty-five million, three hundred ninety-nine thousand, five hundred forty-seven".