6401602666 has 8 divisors (see below), whose sum is σ = 9759820644. Its totient is φ = 3148329120.

The previous prime is 6401602661. The next prime is 6401602667. The reversal of 6401602666 is 6662061046.

It can be written as a sum of positive squares in 2 ways, for example, as 5515290225 + 886312441 = 74265^2 + 29771^2 .

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

It is not an unprimeable number, because it can be changed into a prime (6401602661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26235955 + ... + 26236198.

Almost surely, 2^6401602666 is an apocalyptic number.

6401602666 is a deficient number, since it is larger than the sum of its proper divisors (3358217978).

6401602666 is a wasteful number, since it uses less digits than its factorization.

6401602666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52472216.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 6401602666 is about 80010.0160354940. The cubic root of 6401602666 is about 1856.7904979400.

The spelling of 6401602666 in words is "six billion, four hundred one million, six hundred two thousand, six hundred sixty-six".