1866664515 has 32 divisors (see below), whose sum is σ = 3190383936. Its totient is φ = 928686080.

The previous prime is 1866664511. The next prime is 1866664537. The reversal of 1866664515 is 5154666681.

It is not a de Polignac number, because 1866664515 - 2² = 1866664511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1866664511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3576 + ... + 61205.

It is an arithmetic number, because the mean of its divisors is an integer number (99699498).

Almost surely, 2^1866664515 is an apocalyptic number.

1866664515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1866664515 is a deficient number, since it is larger than the sum of its proper divisors (1323719421).

1866664515 is a wasteful number, since it uses less digits than its factorization.

1866664515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64919.

The product of its digits is 1036800, while the sum is 48.

The square root of 1866664515 is about 43204.9130886755. The cubic root of 1866664515 is about 1231.2760272097.

The spelling of 1866664515 in words is "one billion, eight hundred sixty-six million, six hundred sixty-four thousand, five hundred fifteen".