165425453665 has 24 divisors (see below), whose sum is σ = 203686629480. Its totient is φ = 128952900864.

The previous prime is 165425453653. The next prime is 165425453671. The reversal of 165425453665 is 566354524561.

It can be written as a sum of positive squares in 4 ways, for example, as 26356873104 + 139068580561 = 162348^2 + 372919^2 .

It is not a de Polignac number, because 165425453665 - 2¹⁹ = 165424929377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2481591 + ... + 2547379.

It is an arithmetic number, because the mean of its divisors is an integer number (8486942895).

Almost surely, 2^165425453665 is an apocalyptic number.

It is an amenable number.

165425453665 is a deficient number, since it is larger than the sum of its proper divisors (38261175815).

165425453665 is an frugal number, since it uses more digits than its factorization.

165425453665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66033 (or 65950 counting only the distinct ones).

The product of its digits is 12960000, while the sum is 52.

The spelling of 165425453665 in words is "one hundred sixty-five billion, four hundred twenty-five million, four hundred fifty-three thousand, six hundred sixty-five".