161986545654570 has 2304 divisors, whose sum is σ = 593825074053120. Its totient is φ = 30855889612800.

The previous prime is 161986545654569. The next prime is 161986545654587. The reversal of 161986545654570 is 75456545689161.

161986545654570 is a `hidden beast` number, since 1 + 6 + 1 + 9 + 8 + 6 + 5 + 4 + 5 + 6 + 545 + 70 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 1151 ways as a sum of consecutive naturals, for example, 256714018155 + ... + 256714018785.

It is an arithmetic number, because the mean of its divisors is an integer number (257736577280).

Almost surely, 2^{161986545654570} is an apocalyptic number.

161986545654570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161986545654570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296912537026560).

161986545654570 is an abundant number, since it is smaller than the sum of its proper divisors (431838528398550).

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

161986545654570 is a wasteful number, since it uses less digits than its factorization.

161986545654570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805 (or 784 counting only the distinct ones).

The product of its (nonzero) digits is 1088640000, while the sum is 72.

The spelling of 161986545654570 in words is "one hundred sixty-one trillion, nine hundred eighty-six billion, five hundred forty-five million, six hundred fifty-four thousand, five hundred seventy".