165181403 has 2 divisors, whose sum is σ = 165181404. Its totient is φ = 165181402.

The previous prime is 165181381. The next prime is 165181411. The reversal of 165181403 is 304181561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165181403 - 2⁶ = 165181339 is a prime.

It is not a weakly prime, because it can be changed into another prime (165181433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82590701 + 82590702.

It is an arithmetic number, because the mean of its divisors is an integer number (82590702).

Almost surely, 2^165181403 is an apocalyptic number.

165181403 is a deficient number, since it is larger than the sum of its proper divisors (1).

165181403 is an equidigital number, since it uses as much as digits as its factorization.

165181403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 165181403 is about 12852.2917411643. The cubic root of 165181403 is about 548.6815837204.

The spelling of 165181403 in words is "one hundred sixty-five million, one hundred eighty-one thousand, four hundred three".