165653070025 has 9 divisors (see below), whose sum is σ = 205412330293. Its totient is φ = 132520828000.

The previous prime is 165653070007. The next prime is 165653070047. The reversal of 165653070025 is 520070356561.

The square root of 165653070025 is 407005.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1793268409 + 163859801616 = 42347^2 + 404796^2 .

It is not a de Polignac number, because 165653070025 - 2⁹ = 165653069513 is a prime.

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 165653070025.

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, 1994325 + ... + 2075725.

Almost surely, 2^165653070025 is an apocalyptic number.

165653070025 is the 407005-th square number.

165653070025 is the 203503-rd centered octagonal number.

It is an amenable number.

165653070025 is a deficient number, since it is larger than the sum of its proper divisors (39759260268).

165653070025 is an frugal number, since it uses more digits than its factorization.

165653070025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162812 (or 81406 counting only the distinct ones).

The product of its (nonzero) digits is 189000, while the sum is 40.

The spelling of 165653070025 in words is "one hundred sixty-five billion, six hundred fifty-three million, seventy thousand, twenty-five".