1665553442 has 16 divisors (see below), whose sum is σ = 2869732800. Its totient is φ = 710184048.

The previous prime is 1665553423. The next prime is 1665553459. The reversal of 1665553442 is 2443555661.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1665553442.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299192 + ... + 304707.

It is an arithmetic number, because the mean of its divisors is an integer number (179358300).

Almost surely, 2^1665553442 is an apocalyptic number.

1665553442 is a deficient number, since it is larger than the sum of its proper divisors (1204179358).

1665553442 is a wasteful number, since it uses less digits than its factorization.

1665553442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604105.

The product of its digits is 432000, while the sum is 41.

The square root of 1665553442 is about 40811.1926069308. The cubic root of 1665553442 is about 1185.3670679447.

The spelling of 1665553442 in words is "one billion, six hundred sixty-five million, five hundred fifty-three thousand, four hundred forty-two".