161709231694 has 16 divisors (see below), whose sum is σ = 242932659840. Its totient is φ = 80731747840.

The previous prime is 161709231659. The next prime is 161709231709. The reversal of 161709231694 is 496132907161.

It is a super-2 number, since 2×161709231694² (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 7 ways as a sum of consecutive naturals, for example, 5233362 + ... + 5264170.

It is an arithmetic number, because the mean of its divisors is an integer number (15183291240).

Almost surely, 2^161709231694 is an apocalyptic number.

161709231694 is a deficient number, since it is larger than the sum of its proper divisors (81223428146).

161709231694 is a wasteful number, since it uses less digits than its factorization.

161709231694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34715.

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 161709231694 in words is "one hundred sixty-one billion, seven hundred nine million, two hundred thirty-one thousand, six hundred ninety-four".