165416651 has 4 divisors (see below), whose sum is σ = 170752704. Its totient is φ = 160080600.

The previous prime is 165416639. The next prime is 165416663. The reversal of 165416651 is 156614561.

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

It is an interprime number because it is at equal distance from previous prime (165416639) and next prime (165416663).

It is a cyclic number.

It is not a de Polignac number, because 165416651 - 2¹⁴ = 165400267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165416051) 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, 2667980 + ... + 2668041.

It is an arithmetic number, because the mean of its divisors is an integer number (42688176).

Almost surely, 2^165416651 is an apocalyptic number.

165416651 is a deficient number, since it is larger than the sum of its proper divisors (5336053).

165416651 is an equidigital number, since it uses as much as digits as its factorization.

165416651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5336052.

The product of its digits is 21600, while the sum is 35.

The square root of 165416651 is about 12861.4404714247. The cubic root of 165416651 is about 548.9419338877.

The spelling of 165416651 in words is "one hundred sixty-five million, four hundred sixteen thousand, six hundred fifty-one".