161556107206880 has 24 divisors (see below), whose sum is σ = 381676303276632. Its totient is φ = 64622442882688.

The previous prime is 161556107206817. The next prime is 161556107206889. The reversal of 161556107206880 is 88602701655161.

It is a super-2 number, since 2×161556107206880² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161556107206889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504862834862 + ... + 504862835181.

It is an arithmetic number, because the mean of its divisors is an integer number (15903179303193).

Almost surely, 2^{161556107206880} is an apocalyptic number.

161556107206880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161556107206880 is an abundant number, since it is smaller than the sum of its proper divisors (220120196069752).

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

161556107206880 is a wasteful number, since it uses less digits than its factorization.

161556107206880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009725670058 (or 1009725670050 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 56.

The spelling of 161556107206880 in words is "one hundred sixty-one trillion, five hundred fifty-six billion, one hundred seven million, two hundred six thousand, eight hundred eighty".