1666423242 has 48 divisors (see below), whose sum is σ = 4045290912. Its totient is φ = 491326560.

The previous prime is 1666423217. The next prime is 1666423289. The reversal of 1666423242 is 2423246661.

It is a junction number, because it is equal to n+sod(n) for n = 1666423197 and 1666423206.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106408 + ... + 121059.

It is an arithmetic number, because the mean of its divisors is an integer number (84276894).

Almost surely, 2^1666423242 is an apocalyptic number.

1666423242 is an abundant number, since it is smaller than the sum of its proper divisors (2378867670).

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

1666423242 is a wasteful number, since it uses less digits than its factorization.

1666423242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227523 (or 227520 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 1666423242 is about 40821.8476063982. The cubic root of 1666423242 is about 1185.5733763151.

The spelling of 1666423242 in words is "one billion, six hundred sixty-six million, four hundred twenty-three thousand, two hundred forty-two".