666871442 has 8 divisors (see below), whose sum is σ = 1032575232. Its totient is φ = 322679700.

The previous prime is 666871409. The next prime is 666871463. The reversal of 666871442 is 244178666.

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

It is a junction number, because it is equal to n+sod(n) for n = 666871393 and 666871402.

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, 5377934 + ... + 5378057.

It is an arithmetic number, because the mean of its divisors is an integer number (129071904).

Almost surely, 2^666871442 is an apocalyptic number.

666871442 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

666871442 is a deficient number, since it is larger than the sum of its proper divisors (365703790).

666871442 is a wasteful number, since it uses less digits than its factorization.

666871442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10756024.

The product of its digits is 387072, while the sum is 44.

The square root of 666871442 is about 25823.8541275310. The cubic root of 666871442 is about 873.6698994453.

The spelling of 666871442 in words is "six hundred sixty-six million, eight hundred seventy-one thousand, four hundred forty-two".