165418891380 has 36 divisors (see below), whose sum is σ = 501770637732. Its totient is φ = 44111704320.

The previous prime is 165418891361. The next prime is 165418891439. The reversal of 165418891380 is 83198814561.

It is a happy number.

165418891380 is a `hidden beast` number, since 1 + 6 + 541 + 8 + 8 + 9 + 13 + 80 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 105003217764 + 60415673616 = 324042^2 + 245796^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 459496741 + ... + 459497100.

Almost surely, 2^165418891380 is an apocalyptic number.

165418891380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165418891380 is an abundant number, since it is smaller than the sum of its proper divisors (336351746352).

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

165418891380 is a wasteful number, since it uses less digits than its factorization.

165418891380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918993856 (or 918993851 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 54.

The spelling of 165418891380 in words is "one hundred sixty-five billion, four hundred eighteen million, eight hundred ninety-one thousand, three hundred eighty".