161212015556 has 12 divisors (see below), whose sum is σ = 296969502480. Its totient is φ = 76363586280.

The previous prime is 161212015543. The next prime is 161212015561. The reversal of 161212015556 is 655510212161.

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 3 ways as a sum of consecutive naturals, for example, 1060605290 + ... + 1060605441.

It is an arithmetic number, because the mean of its divisors is an integer number (24747458540).

Almost surely, 2^161212015556 is an apocalyptic number.

It is an amenable number.

161212015556 is a deficient number, since it is larger than the sum of its proper divisors (135757486924).

161212015556 is a wasteful number, since it uses less digits than its factorization.

161212015556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121210754 (or 2121210752 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 35.

The spelling of 161212015556 in words is "one hundred sixty-one billion, two hundred twelve million, fifteen thousand, five hundred fifty-six".