161886740529840 has 320 divisors, whose sum is σ = 531174694643712. Its totient is φ = 40701242982400.

The previous prime is 161886740529721. The next prime is 161886740529887. The reversal of 161886740529840 is 48925047688161.

It is a hoax number, since the sum of its digits (69) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1662084022 + ... + 1662181418.

Almost surely, 2^{161886740529840} is an apocalyptic number.

161886740529840 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 161886740529840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265587347321856).

161886740529840 is an abundant number, since it is smaller than the sum of its proper divisors (369287954113872).

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

161886740529840 is a wasteful number, since it uses less digits than its factorization.

161886740529840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101748 (or 101742 counting only the distinct ones).

The product of its (nonzero) digits is 185794560, while the sum is 69.

The spelling of 161886740529840 in words is "one hundred sixty-one trillion, eight hundred eighty-six billion, seven hundred forty million, five hundred twenty-nine thousand, eight hundred forty".