665420334 has 16 divisors (see below), whose sum is σ = 1333758288. Its totient is φ = 221320512.

The previous prime is 665420323. The next prime is 665420377. The reversal of 665420334 is 433024566.

It is a junction number, because it is equal to n+sod(n) for n = 665420295 and 665420304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118597 + ... + 124080.

It is an arithmetic number, because the mean of its divisors is an integer number (83359893).

Almost surely, 2^665420334 is an apocalyptic number.

665420334 is an abundant number, since it is smaller than the sum of its proper divisors (668337954).

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

665420334 is a wasteful number, since it uses less digits than its factorization.

665420334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243139.

The product of its (nonzero) digits is 51840, while the sum is 33.

The square root of 665420334 is about 25795.7425557009. The cubic root of 665420334 is about 873.0357392054.

The spelling of 665420334 in words is "six hundred sixty-five million, four hundred twenty thousand, three hundred thirty-four".