165420487 has 4 divisors (see below), whose sum is σ = 165523176. Its totient is φ = 165317800.

The previous prime is 165420469. The next prime is 165420491. The reversal of 165420487 is 784024561.

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 165420487 - 2¹¹ = 165418439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165420407) 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, 48889 + ... + 52162.

It is an arithmetic number, because the mean of its divisors is an integer number (41380794).

Almost surely, 2^165420487 is an apocalyptic number.

165420487 is a deficient number, since it is larger than the sum of its proper divisors (102689).

165420487 is a wasteful number, since it uses less digits than its factorization.

165420487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102688.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 165420487 is about 12861.5895984905. The cubic root of 165420487 is about 548.9461771626.

The spelling of 165420487 in words is "one hundred sixty-five million, four hundred twenty thousand, four hundred eighty-seven".