1866351537866 has 8 divisors (see below), whose sum is σ = 2799930195300. Its totient is φ = 933041472768.

The previous prime is 1866351537863. The next prime is 1866351537899. The reversal of 1866351537866 is 6687351536681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1853096851225 + 13254686641 = 1361285^2 + 115129^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1866351537863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67130711 + ... + 67158506.

Almost surely, 2^{1866351537866} is an apocalyptic number.

1866351537866 is a deficient number, since it is larger than the sum of its proper divisors (933578657434).

1866351537866 is a wasteful number, since it uses less digits than its factorization.

1866351537866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134296168.

The product of its digits is 130636800, while the sum is 65.

The spelling of 1866351537866 in words is "one trillion, eight hundred sixty-six billion, three hundred fifty-one million, five hundred thirty-seven thousand, eight hundred sixty-six".