161552005201 has 4 divisors (see below), whose sum is σ = 161552992932. Its totient is φ = 161551017472.

The previous prime is 161552005187. The next prime is 161552005213. The reversal of 161552005201 is 102500255161.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 102500255161 = 167 ⋅613773983.

It can be written as a sum of positive squares in 2 ways, for example, as 103942404801 + 57609600400 = 322401^2 + 240020^2 .

It is a cyclic number.

It is not a de Polignac number, because 161552005201 - 2⁷ = 161552005073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161552005201.

It is not an unprimeable number, because it can be changed into a prime (161552005271) 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, 183520 + ... + 597313.

It is an arithmetic number, because the mean of its divisors is an integer number (40388248233).

Almost surely, 2^161552005201 is an apocalyptic number.

It is an amenable number.

161552005201 is a deficient number, since it is larger than the sum of its proper divisors (987731).

161552005201 is an equidigital number, since it uses as much as digits as its factorization.

161552005201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987730.

The product of its (nonzero) digits is 3000, while the sum is 28.

The spelling of 161552005201 in words is "one hundred sixty-one billion, five hundred fifty-two million, five thousand, two hundred one".