1666358537 has 16 divisors (see below), whose sum is σ = 1707446400. Its totient is φ = 1625961600.

The previous prime is 1666358503. The next prime is 1666358543. The reversal of 1666358537 is 7358536661.

It is a cyclic number.

It is not a de Polignac number, because 1666358537 - 2¹² = 1666354441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666358567) 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, 2254514 + ... + 2255252.

It is an arithmetic number, because the mean of its divisors is an integer number (106715400).

Almost surely, 2^1666358537 is an apocalyptic number.

It is an amenable number.

1666358537 is a deficient number, since it is larger than the sum of its proper divisors (41087863).

1666358537 is a wasteful number, since it uses less digits than its factorization.

1666358537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136.

The product of its digits is 2721600, while the sum is 50.

The square root of 1666358537 is about 40821.0550696574. The cubic root of 1666358537 is about 1185.5580313703.

The spelling of 1666358537 in words is "one billion, six hundred sixty-six million, three hundred fifty-eight thousand, five hundred thirty-seven".