161643535402 has 8 divisors (see below), whose sum is σ = 242467107300. Its totient is φ = 80821166304.

The previous prime is 161643535397. The next prime is 161643535433. The reversal of 161643535402 is 204535346161.

It can be written as a sum of positive squares in 2 ways, for example, as 134262883561 + 27380651841 = 366419^2 + 165471^2 .

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

It is a super-2 number, since 2×161643535402² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206124 + ... + 604792.

Almost surely, 2^161643535402 is an apocalyptic number.

161643535402 is a deficient number, since it is larger than the sum of its proper divisors (80823571898).

161643535402 is a wasteful number, since it uses less digits than its factorization.

161643535402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601400.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 161643535402 in words is "one hundred sixty-one billion, six hundred forty-three million, five hundred thirty-five thousand, four hundred two".