665648754 has 16 divisors (see below), whose sum is σ = 1332652800. Its totient is φ = 221657040.

The previous prime is 665648749. The next prime is 665648777. The reversal of 665648754 is 457846566.

It is a junction number, because it is equal to n+sod(n) for n = 665648697 and 665648706.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50029 + ... + 61920.

It is an arithmetic number, because the mean of its divisors is an integer number (83290800).

Almost surely, 2^665648754 is an apocalyptic number.

665648754 is an abundant number, since it is smaller than the sum of its proper divisors (667004046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665648754 is a wasteful number, since it uses less digits than its factorization.

665648754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112945.

The product of its digits is 4838400, while the sum is 51.

The square root of 665648754 is about 25800.1696506050. The cubic root of 665648754 is about 873.1356239447.

The spelling of 665648754 in words is "six hundred sixty-five million, six hundred forty-eight thousand, seven hundred fifty-four".