161345687998 has 48 divisors (see below), whose sum is σ = 267369102000. Its totient is φ = 72967973760.

The previous prime is 161345687969. The next prime is 161345688001. The reversal of 161345687998 is 899786543161.

It is a super-2 number, since 2×161345687998² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58691128 + ... + 58693876.

It is an arithmetic number, because the mean of its divisors is an integer number (5570189625).

Almost surely, 2^161345687998 is an apocalyptic number.

161345687998 is a deficient number, since it is larger than the sum of its proper divisors (106023414002).

161345687998 is a wasteful number, since it uses less digits than its factorization.

161345687998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3913 (or 3902 counting only the distinct ones).

The product of its digits is 78382080, while the sum is 67.

The spelling of 161345687998 in words is "one hundred sixty-one billion, three hundred forty-five million, six hundred eighty-seven thousand, nine hundred ninety-eight".