165899469 has 16 divisors (see below), whose sum is σ = 235154880. Its totient is φ = 103737600.

The previous prime is 165899467. The next prime is 165899473. The reversal of 165899469 is 964998561.

It is not a de Polignac number, because 165899469 - 2¹ = 165899467 is a prime.

It is a super-2 number, since 2×165899469² = 55045267628963922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165899467) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8652 + ... + 20165.

It is an arithmetic number, because the mean of its divisors is an integer number (14697180).

Almost surely, 2^165899469 is an apocalyptic number.

165899469 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

165899469 is a deficient number, since it is larger than the sum of its proper divisors (69255411).

165899469 is a wasteful number, since it uses less digits than its factorization.

165899469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28940.

The product of its digits is 4199040, while the sum is 57.

The square root of 165899469 is about 12880.1967764472. The cubic root of 165899469 is about 549.4754988726.

The spelling of 165899469 in words is "one hundred sixty-five million, eight hundred ninety-nine thousand, four hundred sixty-nine".