165920516471 has 4 divisors (see below), whose sum is σ = 170404854792. Its totient is φ = 161436178152.

The previous prime is 165920516467. The next prime is 165920516483. The reversal of 165920516471 is 174615029561.

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

It is a cyclic number.

It is not a de Polignac number, because 165920516471 - 2² = 165920516467 is a prime.

It is a super-3 number, since 3×165920516471³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165920516401) 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, 2242169105 + ... + 2242169178.

It is an arithmetic number, because the mean of its divisors is an integer number (42601213698).

Almost surely, 2^165920516471 is an apocalyptic number.

165920516471 is a deficient number, since it is larger than the sum of its proper divisors (4484338321).

165920516471 is an equidigital number, since it uses as much as digits as its factorization.

165920516471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4484338320.

The product of its (nonzero) digits is 453600, while the sum is 47.

The spelling of 165920516471 in words is "one hundred sixty-five billion, nine hundred twenty million, five hundred sixteen thousand, four hundred seventy-one".