165481787 has 2 divisors, whose sum is σ = 165481788. Its totient is φ = 165481786.

The previous prime is 165481777. The next prime is 165481793. The reversal of 165481787 is 787184561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165481787 - 2²⁰ = 164433211 is a prime.

It is not a weakly prime, because it can be changed into another prime (165481727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82740893 + 82740894.

It is an arithmetic number, because the mean of its divisors is an integer number (82740894).

Almost surely, 2^165481787 is an apocalyptic number.

165481787 is a deficient number, since it is larger than the sum of its proper divisors (1).

165481787 is an equidigital number, since it uses as much as digits as its factorization.

165481787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 376320, while the sum is 47.

The square root of 165481787 is about 12863.9724424456. The cubic root of 165481787 is about 549.0139765940.

The spelling of 165481787 in words is "one hundred sixty-five million, four hundred eighty-one thousand, seven hundred eighty-seven".