161206515617212 has 96 divisors (see below), whose sum is σ = 317733079910400. Its totient is φ = 71072491295232.

The previous prime is 161206515617201. The next prime is 161206515617221. The reversal of 161206515617212 is 212716515602161.

161206515617212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138034864 + ... + 139197832.

It is an arithmetic number, because the mean of its divisors is an integer number (3309719582400).

Almost surely, 2^{161206515617212} is an apocalyptic number.

It is an amenable number.

161206515617212 is a deficient number, since it is larger than the sum of its proper divisors (156526564293188).

161206515617212 is a wasteful number, since it uses less digits than its factorization.

161206515617212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164395 (or 1164393 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 46.

The spelling of 161206515617212 in words is "one hundred sixty-one trillion, two hundred six billion, five hundred fifteen million, six hundred seventeen thousand, two hundred twelve".