161665050121 has 8 divisors (see below), whose sum is σ = 163048111488. Its totient is φ = 160286100000.

The previous prime is 161665050119. The next prime is 161665050137. The reversal of 161665050121 is 121050566161.

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

It is a cyclic number.

It is not a de Polignac number, because 161665050121 - 2¹ = 161665050119 is a prime.

It is a super-2 number, since 2×161665050121² (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 (161665000121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 948805 + ... + 1106146.

It is an arithmetic number, because the mean of its divisors is an integer number (20381013936).

Almost surely, 2^161665050121 is an apocalyptic number.

It is an amenable number.

161665050121 is a deficient number, since it is larger than the sum of its proper divisors (1383061367).

161665050121 is a wasteful number, since it uses less digits than its factorization.

161665050121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2055623.

The product of its (nonzero) digits is 10800, while the sum is 34.

The spelling of 161665050121 in words is "one hundred sixty-one billion, six hundred sixty-five million, fifty thousand, one hundred twenty-one".