665144001 has 32 divisors (see below), whose sum is σ = 1039104000. Its totient is φ = 419345424.

The previous prime is 665143981. The next prime is 665144017. The reversal of 665144001 is 100441566.

665144001 is a `hidden beast` number, since 6 + 651 + 4 + 4 + 0 + 0 + 1 = 666.

It is not a de Polignac number, because 665144001 - 2¹⁰ = 665142977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (665144101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 503620 + ... + 504938.

It is an arithmetic number, because the mean of its divisors is an integer number (32472000).

Almost surely, 2^665144001 is an apocalyptic number.

It is an amenable number.

665144001 is a deficient number, since it is larger than the sum of its proper divisors (373959999).

665144001 is a wasteful number, since it uses less digits than its factorization.

665144001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330 (or 2324 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 665144001 is about 25790.3858249542. The cubic root of 665144001 is about 872.9148722510.

Adding to 665144001 its reverse (100441566), we get a palindrome (765585567).

The spelling of 665144001 in words is "six hundred sixty-five million, one hundred forty-four thousand, one".