666446442 has 32 divisors (see below), whose sum is σ = 1370644800. Its totient is φ = 215872128.

The previous prime is 666446437. The next prime is 666446447. The reversal of 666446442 is 244644666.

It is an interprime number because it is at equal distance from previous prime (666446437) and next prime (666446447).

It is a junction number, because it is equal to n+sod(n) for n = 666446394 and 666446403.

It is not an unprimeable number, because it can be changed into a prime (666446447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249309 + ... + 251967.

It is an arithmetic number, because the mean of its divisors is an integer number (42832650).

Almost surely, 2^666446442 is an apocalyptic number.

666446442 is an abundant number, since it is smaller than the sum of its proper divisors (704198358).

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

666446442 is a wasteful number, since it uses less digits than its factorization.

666446442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3830.

The product of its digits is 663552, while the sum is 42.

The square root of 666446442 is about 25815.6239901343. The cubic root of 666446442 is about 873.4842621591.

The spelling of 666446442 in words is "six hundred sixty-six million, four hundred forty-six thousand, four hundred forty-two".