1666727541 has 12 divisors (see below), whose sum is σ = 2425874880. Its totient is φ = 1102668840.

The previous prime is 1666727539. The next prime is 1666727593. The reversal of 1666727541 is 1457276661.

It is not a de Polignac number, because 1666727541 - 2¹ = 1666727539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666727501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 705661 + ... + 708018.

It is an arithmetic number, because the mean of its divisors is an integer number (202156240).

Almost surely, 2^1666727541 is an apocalyptic number.

It is an amenable number.

1666727541 is a deficient number, since it is larger than the sum of its proper divisors (759147339).

1666727541 is a wasteful number, since it uses less digits than its factorization.

1666727541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1413816 (or 1413813 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 1666727541 is about 40825.5745948541. The cubic root of 1666727541 is about 1185.6455362215.

The spelling of 1666727541 in words is "one billion, six hundred sixty-six million, seven hundred twenty-seven thousand, five hundred forty-one".