161587982798 has 8 divisors (see below), whose sum is σ = 264416699160. Its totient is φ = 73449083080.

The previous prime is 161587982797. The next prime is 161587982839. The reversal of 161587982798 is 897289785161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161587982798² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161587982797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3672454133 + ... + 3672454176.

It is an arithmetic number, because the mean of its divisors is an integer number (33052087395).

Almost surely, 2^161587982798 is an apocalyptic number.

161587982798 is a deficient number, since it is larger than the sum of its proper divisors (102828716362).

161587982798 is a wasteful number, since it uses less digits than its factorization.

161587982798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7344908322.

The product of its digits is 121927680, while the sum is 71.

The spelling of 161587982798 in words is "one hundred sixty-one billion, five hundred eighty-seven million, nine hundred eighty-two thousand, seven hundred ninety-eight".