165886061040 has 240 divisors, whose sum is σ = 648700498368. Its totient is φ = 37201342464.

The previous prime is 165886061021. The next prime is 165886061059. The reversal of 165886061040 is 40160688561.

165886061040 is a `hidden beast` number, since 1 + 6 + 588 + 6 + 0 + 61 + 0 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (165886061021) and next prime (165886061059).

It is a tau number, because it is divible by the number of its divisors (240).

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

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, 43389 + ... + 577628.

Almost surely, 2^165886061040 is an apocalyptic number.

165886061040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165886061040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324350249184).

165886061040 is an abundant number, since it is smaller than the sum of its proper divisors (482814437328).

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

165886061040 is a wasteful number, since it uses less digits than its factorization.

165886061040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621096 (or 621087 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 165886061040 in words is "one hundred sixty-five billion, eight hundred eighty-six million, sixty-one thousand, forty".