161216510205 has 64 divisors (see below), whose sum is σ = 271376179200. Its totient is φ = 81638945280.

The previous prime is 161216510167. The next prime is 161216510233. The reversal of 161216510205 is 502015612161.

It is not a de Polignac number, because 161216510205 - 2⁶ = 161216510141 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5158416 + ... + 5189574.

It is an arithmetic number, because the mean of its divisors is an integer number (4240252800).

Almost surely, 2^161216510205 is an apocalyptic number.

161216510205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161216510205 is a deficient number, since it is larger than the sum of its proper divisors (110159668995).

161216510205 is a wasteful number, since it uses less digits than its factorization.

161216510205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31434.

The product of its (nonzero) digits is 3600, while the sum is 30.

The spelling of 161216510205 in words is "one hundred sixty-one billion, two hundred sixteen million, five hundred ten thousand, two hundred five".