166402065 has 24 divisors (see below), whose sum is σ = 268752384. Its totient is φ = 87916800.

The previous prime is 166402063. The next prime is 166402073. The reversal of 166402065 is 560204661.

It is not a de Polignac number, because 166402065 - 2¹ = 166402063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166402063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 690345 + ... + 690585.

It is an arithmetic number, because the mean of its divisors is an integer number (11198016).

Almost surely, 2^166402065 is an apocalyptic number.

166402065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166402065 is a deficient number, since it is larger than the sum of its proper divisors (102350319).

166402065 is an equidigital number, since it uses as much as digits as its factorization.

166402065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681 (or 440 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 166402065 is about 12899.6924381940. The cubic root of 166402065 is about 550.0298220744.

The spelling of 166402065 in words is "one hundred sixty-six million, four hundred two thousand, sixty-five".