161606155050001 has 4 divisors (see below), whose sum is σ = 161606230631604. Its totient is φ = 161606079468400.

The previous prime is 161606155049957. The next prime is 161606155050007. The reversal of 161606155050001 is 100050551606161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32897107360000 + 128709047690001 = 5735600^2 + 11345001^2 .

It is a cyclic number.

It is not a de Polignac number, because 161606155050001 - 2⁹ = 161606155049489 is a prime.

It is a super-2 number, since 2×161606155050001² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161606155050007) 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, 34487290 + ... + 38891971.

It is an arithmetic number, because the mean of its divisors is an integer number (40401557657901).

Almost surely, 2^{161606155050001} is an apocalyptic number.

It is an amenable number.

161606155050001 is a deficient number, since it is larger than the sum of its proper divisors (75581603).

161606155050001 is an equidigital number, since it uses as much as digits as its factorization.

161606155050001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75581602.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 161606155050001 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred fifty-five million, fifty thousand, one".