1866640104825 has 48 divisors (see below), whose sum is σ = 3094384327680. Its totient is φ = 992897686080.

The previous prime is 1866640104793. The next prime is 1866640104827. The reversal of 1866640104825 is 5284010466681.

It is not a de Polignac number, because 1866640104825 - 2⁵ = 1866640104793 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1866640104827) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 45615324 + ... + 45656226.

It is an arithmetic number, because the mean of its divisors is an integer number (64466340160).

Almost surely, 2^{1866640104825} is an apocalyptic number.

1866640104825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1866640104825 is a deficient number, since it is larger than the sum of its proper divisors (1227744222855).

1866640104825 is a wasteful number, since it uses less digits than its factorization.

1866640104825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42518 (or 42513 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 51.

The spelling of 1866640104825 in words is "one trillion, eight hundred sixty-six billion, six hundred forty million, one hundred four thousand, eight hundred twenty-five".