150221658161 has 4 divisors (see below), whose sum is σ = 150225629172. Its totient is φ = 150217687152.

The previous prime is 150221658151. The next prime is 150221658173. The reversal of 150221658161 is 161856122051.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161856122051 = 13 ⋅12450470927.

It can be written as a sum of positive squares in 2 ways, for example, as 114856599025 + 35365059136 = 338905^2 + 188056^2 .

It is a cyclic number.

It is not a de Polignac number, because 150221658161 - 2³⁴ = 133041788977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (150221658151) 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, 1928210 + ... + 2004603.

It is an arithmetic number, because the mean of its divisors is an integer number (37556407293).

Almost surely, 2^150221658161 is an apocalyptic number.

It is an amenable number.

150221658161 is a deficient number, since it is larger than the sum of its proper divisors (3971011).

150221658161 is an equidigital number, since it uses as much as digits as its factorization.

150221658161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3971010.

The product of its (nonzero) digits is 28800, while the sum is 38.

The spelling of 150221658161 in words is "one hundred fifty billion, two hundred twenty-one million, six hundred fifty-eight thousand, one hundred sixty-one".