161785655760 has 160 divisors (see below), whose sum is σ = 538964468352. Its totient is φ = 39998914560.

The previous prime is 161785655753. The next prime is 161785655783. The reversal of 161785655760 is 67556587161.

It is a self number, because there is not a number n which added to its sum of digits gives 161785655760.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22561 + ... + 569280.

Almost surely, 2^161785655760 is an apocalyptic number.

161785655760 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 161785655760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269482234176).

161785655760 is an abundant number, since it is smaller than the sum of its proper divisors (377178812592).

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

161785655760 is a wasteful number, since it uses less digits than its factorization.

161785655760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591941 (or 591935 counting only the distinct ones).

The product of its (nonzero) digits is 10584000, while the sum is 57.

The spelling of 161785655760 in words is "one hundred sixty-one billion, seven hundred eighty-five million, six hundred fifty-five thousand, seven hundred sixty".