666849229642 has 8 divisors (see below), whose sum is σ = 1013976226116. Its totient is φ = 328857154272.

The previous prime is 666849229639. The next prime is 666849229691. The reversal of 666849229642 is 246922948666.

It can be written as a sum of positive squares in 2 ways, for example, as 632201502321 + 34647727321 = 795111^2 + 186139^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2283730093 + ... + 2283730384.

Almost surely, 2^666849229642 is an apocalyptic number.

666849229642 is a deficient number, since it is larger than the sum of its proper divisors (347126996474).

666849229642 is a wasteful number, since it uses less digits than its factorization.

666849229642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4567460552.

The product of its digits is 107495424, while the sum is 64.

The spelling of 666849229642 in words is "six hundred sixty-six billion, eight hundred forty-nine million, two hundred twenty-nine thousand, six hundred forty-two".