165423204540 has 144 divisors (see below), whose sum is σ = 562195277280. Its totient is φ = 39018723840.

The previous prime is 165423204521. The next prime is 165423204581. The reversal of 165423204540 is 45402324561.

165423204540 is a `hidden beast` number, since 1 + 6 + 542 + 32 + 0 + 45 + 40 = 666.

It is a super-2 number, since 2×165423204540² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 165423204495 and 165423204504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1055755 + ... + 1202274.

It is an arithmetic number, because the mean of its divisors is an integer number (3904133870).

Almost surely, 2^165423204540 is an apocalyptic number.

165423204540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165423204540 is an abundant number, since it is smaller than the sum of its proper divisors (396772072740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165423204540 is a wasteful number, since it uses less digits than its factorization.

165423204540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2258092 (or 2258087 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

It can be divided in two parts, 165423 and 204540, that added together give a palindrome (369963).

The spelling of 165423204540 in words is "one hundred sixty-five billion, four hundred twenty-three million, two hundred four thousand, five hundred forty".