161857317286 has 16 divisors (see below), whose sum is σ = 284237241120. Its totient is φ = 67675533120.

The previous prime is 161857317269. The next prime is 161857317311. The reversal of 161857317286 is 682713758161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140990121 + ... + 140991268.

It is an arithmetic number, because the mean of its divisors is an integer number (17764827570).

Almost surely, 2^161857317286 is an apocalyptic number.

161857317286 is a deficient number, since it is larger than the sum of its proper divisors (122379923834).

161857317286 is a wasteful number, since it uses less digits than its factorization.

161857317286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281981439.

The product of its digits is 3386880, while the sum is 55.

The spelling of 161857317286 in words is "one hundred sixty-one billion, eight hundred fifty-seven million, three hundred seventeen thousand, two hundred eighty-six".