165487053601 has 15 divisors (see below), whose sum is σ = 173234437491. Its totient is φ = 158086123008.

The previous prime is 165487053593. The next prime is 165487053623. The reversal of 165487053601 is 106350784561.

It is a happy number.

The square root of 165487053601 is 406801.

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

It can be written as a sum of positive squares in only one way, i.e., 64744293601 + 100742760000 = 254449^2 + 317400^2 .

It is not a de Polignac number, because 165487053601 - 2³ = 165487053593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165487053631) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 215197345 + ... + 215198113.

Almost surely, 2^165487053601 is an apocalyptic number.

165487053601 is the 406801-st square number.

165487053601 is the 203401-st centered octagonal number.

It is an amenable number.

165487053601 is a deficient number, since it is larger than the sum of its proper divisors (7747383890).

165487053601 is an frugal number, since it uses more digits than its factorization.

165487053601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630 (or 792 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 165487053601 in words is "one hundred sixty-five billion, four hundred eighty-seven million, fifty-three thousand, six hundred one".