161212015554 has 32 divisors (see below), whose sum is σ = 324057350400. Its totient is φ = 53465795712.

The previous prime is 161212015543. The next prime is 161212015561. The reversal of 161212015554 is 455510212161.

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 872727 + ... + 1041189.

It is an arithmetic number, because the mean of its divisors is an integer number (10126792200).

Almost surely, 2^161212015554 is an apocalyptic number.

161212015554 is an abundant number, since it is smaller than the sum of its proper divisors (162845334846).

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

161212015554 is a wasteful number, since it uses less digits than its factorization.

161212015554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169274.

The product of its (nonzero) digits is 12000, while the sum is 33.

The spelling of 161212015554 in words is "one hundred sixty-one billion, two hundred twelve million, fifteen thousand, five hundred fifty-four".