161691526080 has 2240 divisors, whose sum is σ = 764760268800. Its totient is φ = 31531991040.

The previous prime is 161691526069. The next prime is 161691526151. The reversal of 161691526080 is 80625196161.

161691526080 is a `hidden beast` number, since 1 + 61 + 69 + 1 + 526 + 0 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (2240).

It is a super-2 number, since 2×161691526080² (a number of 23 digits) contains 22 as substring.

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 319 ways as a sum of consecutive naturals, for example, 1816758676 + ... + 1816758764.

Almost surely, 2^161691526080 is an apocalyptic number.

161691526080 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 161691526080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (382380134400).

161691526080 is an abundant number, since it is smaller than the sum of its proper divisors (603068742720).

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

161691526080 is a wasteful number, since it uses less digits than its factorization.

161691526080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 161691526080 in words is "one hundred sixty-one billion, six hundred ninety-one million, five hundred twenty-six thousand, eighty".