161693718 has 16 divisors (see below), whose sum is σ = 325373376. Its totient is φ = 53566920.

The previous prime is 161693659. The next prime is 161693723. The reversal of 161693718 is 817396161.

It is a super-2 number, since 2×161693718² = 52289716881327048, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161693718.

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, 81688 + ... + 83643.

It is an arithmetic number, because the mean of its divisors is an integer number (20335836).

Almost surely, 2^161693718 is an apocalyptic number.

161693718 is an abundant number, since it is smaller than the sum of its proper divisors (163679658).

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

161693718 is a wasteful number, since it uses less digits than its factorization.

161693718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165499.

The product of its digits is 54432, while the sum is 42.

The square root of 161693718 is about 12715.8844757256. The cubic root of 161693718 is about 544.7924109099.

The spelling of 161693718 in words is "one hundred sixty-one million, six hundred ninety-three thousand, seven hundred eighteen".