1666053447 has 16 divisors (see below), whose sum is σ = 2279067648. Its totient is φ = 1082007360.

The previous prime is 1666053443. The next prime is 1666053469. The reversal of 1666053447 is 7443506661.

It is not a de Polignac number, because 1666053447 - 2² = 1666053443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1666053399 and 1666053408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666053443) 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, 32547 + ... + 66267.

It is an arithmetic number, because the mean of its divisors is an integer number (142441728).

Almost surely, 2^1666053447 is an apocalyptic number.

1666053447 is a deficient number, since it is larger than the sum of its proper divisors (613014201).

1666053447 is a wasteful number, since it uses less digits than its factorization.

1666053447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34150.

The product of its (nonzero) digits is 362880, while the sum is 42.

The square root of 1666053447 is about 40817.3179790147. The cubic root of 1666053447 is about 1185.4856731976.

It can be divided in two parts, 16660 and 53447, that added together give a palindrome (70107).

The spelling of 1666053447 in words is "one billion, six hundred sixty-six million, fifty-three thousand, four hundred forty-seven".