165836440990 has 32 divisors (see below), whose sum is σ = 325667174400. Its totient is φ = 60299584800.

The previous prime is 165836440967. The next prime is 165836440993. The reversal of 165836440990 is 99044638561.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165836440993) 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, 1622295 + ... + 1721485.

It is an arithmetic number, because the mean of its divisors is an integer number (10177099200).

Almost surely, 2^165836440990 is an apocalyptic number.

165836440990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165836440990 is a deficient number, since it is larger than the sum of its proper divisors (159830733410).

165836440990 is a wasteful number, since it uses less digits than its factorization.

165836440990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114408.

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 165836440990 in words is "one hundred sixty-five billion, eight hundred thirty-six million, four hundred forty thousand, nine hundred ninety".