165652820505 has 24 divisors (see below), whose sum is σ = 287168368968. Its totient is φ = 88336843776.

The previous prime is 165652820483. The next prime is 165652820513. The reversal of 165652820505 is 505028256561.

165652820505 is a `hidden beast` number, since 1 + 6 + 5 + 65 + 2 + 82 + 0 + 505 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1216893456 + 164435927049 = 34884^2 + 405507^2 .

It is not a de Polignac number, because 165652820505 - 2¹³ = 165652812313 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124969 + ... + 589001.

It is an arithmetic number, because the mean of its divisors is an integer number (11965348707).

Almost surely, 2^165652820505 is an apocalyptic number.

165652820505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165652820505 is a deficient number, since it is larger than the sum of its proper divisors (121515548463).

165652820505 is a wasteful number, since it uses less digits than its factorization.

165652820505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471977 (or 471974 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 45.

The spelling of 165652820505 in words is "one hundred sixty-five billion, six hundred fifty-two million, eight hundred twenty thousand, five hundred five".