161201556270 has 48 divisors (see below), whose sum is σ = 434647165680. Its totient is φ = 42987081024.

The previous prime is 161201556251. The next prime is 161201556287. The reversal of 161201556270 is 72655102161.

161201556270 is a `hidden beast` number, since 1 + 6 + 1 + 20 + 1 + 5 + 5 + 627 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33166615 + ... + 33171474.

It is an arithmetic number, because the mean of its divisors is an integer number (9055149285).

Almost surely, 2^161201556270 is an apocalyptic number.

161201556270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161201556270 is an abundant number, since it is smaller than the sum of its proper divisors (273445609410).

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

161201556270 is an equidigital number, since it uses as much as digits as its factorization.

161201556270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66338111 (or 66338099 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 161201556270 in words is "one hundred sixty-one billion, two hundred one million, five hundred fifty-six thousand, two hundred seventy".