665903742 has 32 divisors (see below), whose sum is σ = 1574553600. Its totient is φ = 183697248.

The previous prime is 665903741. The next prime is 665903761. The reversal of 665903742 is 247309566.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 665903694 and 665903703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665903741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272142 + ... + 274577.

It is an arithmetic number, because the mean of its divisors is an integer number (49204800).

Almost surely, 2^665903742 is an apocalyptic number.

665903742 is an abundant number, since it is smaller than the sum of its proper divisors (908649858).

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

665903742 is a wasteful number, since it uses less digits than its factorization.

665903742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546760.

The product of its (nonzero) digits is 272160, while the sum is 42.

The square root of 665903742 is about 25805.1107728682. The cubic root of 665903742 is about 873.2470994952.

The spelling of 665903742 in words is "six hundred sixty-five million, nine hundred three thousand, seven hundred forty-two".