2403642001666 has 8 divisors (see below), whose sum is σ = 3729789313020. Its totient is φ = 1160378897328.

The previous prime is 2403642001613. The next prime is 2403642001667. The reversal of 2403642001666 is 6661002463042.

It can be written as a sum of positive squares in 2 ways, for example, as 2246446404225 + 157195597441 = 1498815^2 + 396479^2 .

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 (2403642001667) 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, 20721051681 + ... + 20721051796.

Almost surely, 2^{2403642001666} is an apocalyptic number.

2403642001666 is a deficient number, since it is larger than the sum of its proper divisors (1326147311354).

2403642001666 is a wasteful number, since it uses less digits than its factorization.

2403642001666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41442103508.

The product of its (nonzero) digits is 248832, while the sum is 40.

The spelling of 2403642001666 in words is "two trillion, four hundred three billion, six hundred forty-two million, one thousand, six hundred sixty-six".