161011210206 has 64 divisors (see below), whose sum is σ = 401967751680. Its totient is φ = 41770546560.

The previous prime is 161011210181. The next prime is 161011210219. The reversal of 161011210206 is 602012110161.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 172800 + ... + 593196.

It is an arithmetic number, because the mean of its divisors is an integer number (6280746120).

Almost surely, 2^161011210206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161011210206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200983875840).

161011210206 is an abundant number, since it is smaller than the sum of its proper divisors (240956541474).

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

161011210206 is a wasteful number, since it uses less digits than its factorization.

161011210206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421249.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 161011210206 its reverse (602012110161), we get a palindrome (763023320367).

The spelling of 161011210206 in words is "one hundred sixty-one billion, eleven million, two hundred ten thousand, two hundred six".