161684307637634 has 8 divisors (see below), whose sum is σ = 245251477877580. Its totient is φ = 79933815011776.

The previous prime is 161684307637621. The next prime is 161684307637637. The reversal of 161684307637634 is 436736703486161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 159223942849609 + 2460364788025 = 12618397^2 + 1568555^2 .

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

It is a super-2 number, since 2×161684307637634² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161684307637637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454169403299 + ... + 454169403654.

Almost surely, 2^{161684307637634} is an apocalyptic number.

161684307637634 is a deficient number, since it is larger than the sum of its proper divisors (83567170239946).

161684307637634 is an equidigital number, since it uses as much as digits as its factorization.

161684307637634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908338807044.

The product of its (nonzero) digits is 219469824, while the sum is 65.

The spelling of 161684307637634 in words is "one hundred sixty-one trillion, six hundred eighty-four billion, three hundred seven million, six hundred thirty-seven thousand, six hundred thirty-four".