161645624205 has 16 divisors (see below), whose sum is σ = 278527845120. Its totient is φ = 79579384128.

The previous prime is 161645624201. The next prime is 161645624233. The reversal of 161645624205 is 502426546161.

It is not a de Polignac number, because 161645624205 - 2² = 161645624201 is a prime.

It is a super-2 number, since 2×161645624205² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161645624201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 414475765 + ... + 414476154.

It is an arithmetic number, because the mean of its divisors is an integer number (17407990320).

Almost surely, 2^161645624205 is an apocalyptic number.

161645624205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161645624205 is a deficient number, since it is larger than the sum of its proper divisors (116882220915).

161645624205 is a wasteful number, since it uses less digits than its factorization.

161645624205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828951940.

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 161645624205 in words is "one hundred sixty-one billion, six hundred forty-five million, six hundred twenty-four thousand, two hundred five".