165996547 has 2 divisors, whose sum is σ = 165996548. Its totient is φ = 165996546.

The previous prime is 165996533. The next prime is 165996581. The reversal of 165996547 is 745699561.

It is a weak prime.

It is an emirp because it is prime and its reverse (745699561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165996547 - 2¹⁵ = 165963779 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165996494 and 165996503.

It is not a weakly prime, because it can be changed into another prime (165996947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82998273 + 82998274.

It is an arithmetic number, because the mean of its divisors is an integer number (82998274).

Almost surely, 2^165996547 is an apocalyptic number.

165996547 is a deficient number, since it is larger than the sum of its proper divisors (1).

165996547 is an equidigital number, since it uses as much as digits as its factorization.

165996547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2041200, while the sum is 52.

The square root of 165996547 is about 12883.9647236400. The cubic root of 165996547 is about 549.5826552962.

The spelling of 165996547 in words is "one hundred sixty-five million, nine hundred ninety-six thousand, five hundred forty-seven".