1866826666840 has 16 divisors (see below), whose sum is σ = 4200360000480. Its totient is φ = 746730666720.

The previous prime is 1866826666813. The next prime is 1866826666849. The reversal of 1866826666840 is 486666286681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866826666849) 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, 23335333296 + ... + 23335333375.

It is an arithmetic number, because the mean of its divisors is an integer number (262522500030).

Almost surely, 2^{1866826666840} is an apocalyptic number.

1866826666840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1866826666840 is an abundant number, since it is smaller than the sum of its proper divisors (2333533333640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1866826666840 is a wasteful number, since it uses less digits than its factorization.

1866826666840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46670666682 (or 46670666678 counting only the distinct ones).

The product of its (nonzero) digits is 191102976, while the sum is 67.

The spelling of 1866826666840 in words is "one trillion, eight hundred sixty-six billion, eight hundred twenty-six million, six hundred sixty-six thousand, eight hundred forty".