666240640446 has 8 divisors (see below), whose sum is σ = 1332481280904. Its totient is φ = 222080213480.

The previous prime is 666240640427. The next prime is 666240640463. The reversal of 666240640446 is 644046042666.

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

666240640446 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 666240640395 and 666240640404.

It is a congruent number.

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, 55520053365 + ... + 55520053376.

It is an arithmetic number, because the mean of its divisors is an integer number (166560160113).

Almost surely, 2^666240640446 is an apocalyptic number.

666240640446 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666240640446 is a wasteful number, since it uses less digits than its factorization.

666240640446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111040106746.

The product of its (nonzero) digits is 3981312, while the sum is 48.

The spelling of 666240640446 in words is "six hundred sixty-six billion, two hundred forty million, six hundred forty thousand, four hundred forty-six".