1665054801 has 12 divisors (see below), whose sum is σ = 2509648128. Its totient is φ = 1061773944.

The previous prime is 1665054799. The next prime is 1665054821. The reversal of 1665054801 is 1084505661.

1665054801 is a `hidden beast` number, since 1 + 66 + 50 + 548 + 0 + 1 = 666.

1665054801 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1665054801 - 2¹ = 1665054799 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1665054821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4021665 + ... + 4022078.

It is an arithmetic number, because the mean of its divisors is an integer number (209137344).

Almost surely, 2^1665054801 is an apocalyptic number.

It is an amenable number.

1665054801 is a deficient number, since it is larger than the sum of its proper divisors (844593327).

1665054801 is a wasteful number, since it uses less digits than its factorization.

1665054801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8043772 (or 8043769 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 1665054801 is about 40805.0830289561. The cubic root of 1665054801 is about 1185.2487626012.

The spelling of 1665054801 in words is "one billion, six hundred sixty-five million, fifty-four thousand, eight hundred one".