662666405 has 8 divisors (see below), whose sum is σ = 795360384. Its totient is φ = 530026000.

The previous prime is 662666393. The next prime is 662666419. The reversal of 662666405 is 504666266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 662666405 - 2¹⁸ = 662404261 is a prime.

It is a Duffinian number.

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, 22640 + ... + 42870.

It is an arithmetic number, because the mean of its divisors is an integer number (99420048).

Almost surely, 2^662666405 is an apocalyptic number.

It is an amenable number.

662666405 is a deficient number, since it is larger than the sum of its proper divisors (132693979).

662666405 is a wasteful number, since it uses less digits than its factorization.

662666405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26787.

The product of its (nonzero) digits is 311040, while the sum is 41.

The square root of 662666405 is about 25742.3076859865. The cubic root of 662666405 is about 871.8296830375.

The spelling of 662666405 in words is "six hundred sixty-two million, six hundred sixty-six thousand, four hundred five".