161505557218510 has 16 divisors (see below), whose sum is σ = 294212533151376. Its totient is φ = 63823882852288.

The previous prime is 161505557218463. The next prime is 161505557218531. The reversal of 161505557218510 is 15812755505161.

161505557218510 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161505557218510² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97292503519 + ... + 97292505178.

It is an arithmetic number, because the mean of its divisors is an integer number (18388283321961).

Almost surely, 2^{161505557218510} is an apocalyptic number.

161505557218510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161505557218510 is a deficient number, since it is larger than the sum of its proper divisors (132706975932866).

161505557218510 is a wasteful number, since it uses less digits than its factorization.

161505557218510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194585008787.

The product of its (nonzero) digits is 2100000, while the sum is 52.

The spelling of 161505557218510 in words is "one hundred sixty-one trillion, five hundred five billion, five hundred fifty-seven million, two hundred eighteen thousand, five hundred ten".