1864382606821 has 24 divisors (see below), whose sum is σ = 2283951595680. Its totient is φ = 1513248966432.

The previous prime is 1864382606809. The next prime is 1864382606837. The reversal of 1864382606821 is 1286062834681.

It is not a de Polignac number, because 1864382606821 - 2⁷ = 1864382606693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1864382606321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1607850 + ... + 2512756.

It is an arithmetic number, because the mean of its divisors is an integer number (95164649820).

Almost surely, 2^{1864382606821} is an apocalyptic number.

It is an amenable number.

1864382606821 is a deficient number, since it is larger than the sum of its proper divisors (419568988859).

1864382606821 is a wasteful number, since it uses less digits than its factorization.

1864382606821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907153 (or 907146 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 55.

The spelling of 1864382606821 in words is "one trillion, eight hundred sixty-four billion, three hundred eighty-two million, six hundred six thousand, eight hundred twenty-one".