165435500987 has 4 divisors (see below), whose sum is σ = 172628348880. Its totient is φ = 158242653096.

The previous prime is 165435500983. The next prime is 165435501029. The reversal of 165435500987 is 789005534561.

It is a happy number.

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

It is not a de Polignac number, because 165435500987 - 2² = 165435500983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165435500983) 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, 3596423912 + ... + 3596423957.

It is an arithmetic number, because the mean of its divisors is an integer number (43157087220).

Almost surely, 2^165435500987 is an apocalyptic number.

165435500987 is a deficient number, since it is larger than the sum of its proper divisors (7192847893).

165435500987 is an equidigital number, since it uses as much as digits as its factorization.

165435500987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7192847892.

The product of its (nonzero) digits is 4536000, while the sum is 53.

The spelling of 165435500987 in words is "one hundred sixty-five billion, four hundred thirty-five million, five hundred thousand, nine hundred eighty-seven".