165001689616 has 45 divisors (see below), whose sum is σ = 322098096301. Its totient is φ = 81884227136.

The previous prime is 165001689583. The next prime is 165001689649. The reversal of 165001689616 is 616986100561.

The square root of 165001689616 is 406204.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (165001689583) and next prime (165001689649).

It can be written as a sum of positive squares in only one way, i.e., 150094256400 + 14907433216 = 387420^2 + 122096^2 .

It is a super-2 number, since 2×165001689616² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165001689616.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 281092875 + ... + 281093461.

Almost surely, 2^165001689616 is an apocalyptic number.

165001689616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

165001689616 is the 406204-th square number.

It is an amenable number.

165001689616 is a deficient number, since it is larger than the sum of its proper divisors (157096406685).

165001689616 is an frugal number, since it uses more digits than its factorization.

165001689616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 49.

Multiplying 165001689616 by its sum of digits (49), we get a square (8085082791184 = 2843428²).

The spelling of 165001689616 in words is "one hundred sixty-five billion, one million, six hundred eighty-nine thousand, six hundred sixteen".