662686409 has 16 divisors (see below), whose sum is σ = 826788480. Its totient is φ = 516015360.

The previous prime is 662686393. The next prime is 662686421. The reversal of 662686409 is 904686266.

It is not a de Polignac number, because 662686409 - 2⁴ = 662686393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (662686429) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 172817 + ... + 176609.

It is an arithmetic number, because the mean of its divisors is an integer number (51674280).

Almost surely, 2^662686409 is an apocalyptic number.

It is an amenable number.

662686409 is a deficient number, since it is larger than the sum of its proper divisors (164102071).

662686409 is a wasteful number, since it uses less digits than its factorization.

662686409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6080.

The product of its (nonzero) digits is 746496, while the sum is 47.

The square root of 662686409 is about 25742.6962263085. The cubic root of 662686409 is about 871.8384556292.

The spelling of 662686409 in words is "six hundred sixty-two million, six hundred eighty-six thousand, four hundred nine".