161535652201 has 32 divisors (see below), whose sum is σ = 204318443520. Its totient is φ = 124046361600.

The previous prime is 161535652199. The next prime is 161535652207. The reversal of 161535652201 is 102256535161.

It is a happy number.

It is not a de Polignac number, because 161535652201 - 2¹ = 161535652199 is a prime.

It is a super-2 number, since 2×161535652201² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161535652207) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17145270 + ... + 17154688.

It is an arithmetic number, because the mean of its divisors is an integer number (6384951360).

Almost surely, 2^161535652201 is an apocalyptic number.

161535652201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161535652201 is a deficient number, since it is larger than the sum of its proper divisors (42782791319).

161535652201 is a wasteful number, since it uses less digits than its factorization.

161535652201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12645.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 161535652201 in words is "one hundred sixty-one billion, five hundred thirty-five million, six hundred fifty-two thousand, two hundred one".