665544414 has 16 divisors (see below), whose sum is σ = 1332768528. Its totient is φ = 221568192.

The previous prime is 665544391. The next prime is 665544437. The reversal of 665544414 is 414445566.

It is an interprime number because it is at equal distance from previous prime (665544391) and next prime (665544437).

It is a congruent number.

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, 64807 + ... + 74370.

It is an arithmetic number, because the mean of its divisors is an integer number (83298033).

Almost surely, 2^665544414 is an apocalyptic number.

665544414 is an abundant number, since it is smaller than the sum of its proper divisors (667224114).

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

665544414 is a wasteful number, since it uses less digits than its factorization.

665544414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139979.

The product of its digits is 230400, while the sum is 39.

The square root of 665544414 is about 25798.1474916320. The cubic root of 665544414 is about 873.0900004178.

The spelling of 665544414 in words is "six hundred sixty-five million, five hundred forty-four thousand, four hundred fourteen".