161049431436 has 12 divisors (see below), whose sum is σ = 375782006712. Its totient is φ = 53683143808.

The previous prime is 161049431423. The next prime is 161049431443. The reversal of 161049431436 is 634134940161.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6710392965 + ... + 6710392988.

It is an arithmetic number, because the mean of its divisors is an integer number (31315167226).

Almost surely, 2^161049431436 is an apocalyptic number.

It is an amenable number.

161049431436 is an abundant number, since it is smaller than the sum of its proper divisors (214732575276).

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

161049431436 is a wasteful number, since it uses less digits than its factorization.

161049431436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13420785960 (or 13420785958 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 42.

The spelling of 161049431436 in words is "one hundred sixty-one billion, forty-nine million, four hundred thirty-one thousand, four hundred thirty-six".