665603464838 has 32 divisors (see below), whose sum is σ = 1079214192000. Its totient is φ = 306058346496.

The previous prime is 665603464831. The next prime is 665603464853. The reversal of 665603464838 is 838464306566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665603464831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7814243 + ... + 7898961.

It is an arithmetic number, because the mean of its divisors is an integer number (33725443500).

Almost surely, 2^665603464838 is an apocalyptic number.

665603464838 is a deficient number, since it is larger than the sum of its proper divisors (413610727162).

665603464838 is a wasteful number, since it uses less digits than its factorization.

665603464838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85856.

The product of its (nonzero) digits is 59719680, while the sum is 59.

The spelling of 665603464838 in words is "six hundred sixty-five billion, six hundred three million, four hundred sixty-four thousand, eight hundred thirty-eight".