161000643546 has 40 divisors (see below), whose sum is σ = 360820453620. Its totient is φ = 53657992512.

The previous prime is 161000643533. The next prime is 161000643569. The reversal of 161000643546 is 645346000161.

It is a happy number.

161000643546 is a `hidden beast` number, since 1 + 6 + 1 + 0 + 0 + 0 + 643 + 5 + 4 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 111363031521 + 49637612025 = 333711^2 + 222795^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 161000643546.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 937710 + ... + 1096038.

Almost surely, 2^161000643546 is an apocalyptic number.

161000643546 is an abundant number, since it is smaller than the sum of its proper divisors (199819810074).

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

161000643546 is a wasteful number, since it uses less digits than its factorization.

161000643546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164620 (or 164611 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

It can be divided in two parts, 161000 and 643546, that added together give a triangular number (804546 = T₁₂₆₈).

The spelling of 161000643546 in words is "one hundred sixty-one billion, six hundred forty-three thousand, five hundred forty-six".