165561220341 has 48 divisors (see below), whose sum is σ = 275825571840. Its totient is φ = 94640067360.

The previous prime is 165561220339. The next prime is 165561220343. The reversal of 165561220341 is 143022165561.

165561220341 is a `hidden beast` number, since 1 + 6 + 5 + 5 + 612 + 2 + 0 + 34 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (165561220339) and next prime (165561220343).

It is not a de Polignac number, because 165561220341 - 2¹ = 165561220339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165561220296 and 165561220305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165561220343) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 233116 + ... + 620858.

It is an arithmetic number, because the mean of its divisors is an integer number (5746366080).

Almost surely, 2^165561220341 is an apocalyptic number.

165561220341 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165561220341 is a deficient number, since it is larger than the sum of its proper divisors (110264351499).

165561220341 is a wasteful number, since it uses less digits than its factorization.

165561220341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388006 (or 388003 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 165561220341 in words is "one hundred sixty-five billion, five hundred sixty-one million, two hundred twenty thousand, three hundred forty-one".