165638487 has 16 divisors (see below), whose sum is σ = 260544512. Its totient is φ = 91596960.

The previous prime is 165638443. The next prime is 165638491. The reversal of 165638487 is 784836561.

It is not a de Polignac number, because 165638487 - 2⁶ = 165638423 is a prime.

It is a super-2 number, since 2×165638487² = 54872216751298338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165638437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126568 + ... + 127869.

It is an arithmetic number, because the mean of its divisors is an integer number (16284032).

Almost surely, 2^165638487 is an apocalyptic number.

165638487 is a deficient number, since it is larger than the sum of its proper divisors (94906025).

165638487 is a wasteful number, since it uses less digits than its factorization.

165638487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254478.

The product of its digits is 967680, while the sum is 48.

The square root of 165638487 is about 12870.0616548640. The cubic root of 165638487 is about 549.1872148921.

The spelling of 165638487 in words is "one hundred sixty-five million, six hundred thirty-eight thousand, four hundred eighty-seven".