165612387 has 4 divisors (see below), whose sum is σ = 220816520. Its totient is φ = 110408256.

The previous prime is 165612347. The next prime is 165612389. The reversal of 165612387 is 783216561.

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

It is not a de Polignac number, because 165612387 - 2⁸ = 165612131 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165612389) 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, 27602062 + ... + 27602067.

It is an arithmetic number, because the mean of its divisors is an integer number (55204130).

Almost surely, 2^165612387 is an apocalyptic number.

165612387 is a deficient number, since it is larger than the sum of its proper divisors (55204133).

165612387 is an equidigital number, since it uses as much as digits as its factorization.

165612387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55204132.

The product of its digits is 60480, while the sum is 39.

The square root of 165612387 is about 12869.0476337606. The cubic root of 165612387 is about 549.1583678540.

The spelling of 165612387 in words is "one hundred sixty-five million, six hundred twelve thousand, three hundred eighty-seven".