165618214920 has 112 divisors (see below), whose sum is σ = 558705990060. Its totient is φ = 44164849536.

The previous prime is 165618214913. The next prime is 165618214987. The reversal of 165618214920 is 29412816561.

165618214920 is a `hidden beast` number, since 1 + 6 + 5 + 618 + 2 + 1 + 4 + 9 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 163893806244 + 1724408676 = 404838^2 + 41526^2 .

It is a super-2 number, since 2×165618214920² (a number of 23 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2810659 + ... + 2868978.

Almost surely, 2^165618214920 is an apocalyptic number.

165618214920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165618214920 is an abundant number, since it is smaller than the sum of its proper divisors (393087775140).

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

165618214920 is an equidigital number, since it uses as much as digits as its factorization.

165618214920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5679666 (or 5679647 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 165618214920 in words is "one hundred sixty-five billion, six hundred eighteen million, two hundred fourteen thousand, nine hundred twenty".