3712821861655 has 8 divisors (see below), whose sum is σ = 4487439373200. Its totient is φ = 2948888729856.

The previous prime is 3712821861569. The next prime is 3712821861659. The reversal of 3712821861655 is 5561681282173.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 3712821861655 - 2⁷ = 3712821861527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3712821861596 and 3712821861605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3712821861659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2671094170 + ... + 2671095559.

It is an arithmetic number, because the mean of its divisors is an integer number (560929921650).

Almost surely, 2^{3712821861655} is an apocalyptic number.

3712821861655 is a deficient number, since it is larger than the sum of its proper divisors (774617511545).

3712821861655 is a wasteful number, since it uses less digits than its factorization.

3712821861655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5342189873.

The product of its digits is 4838400, while the sum is 55.

The spelling of 3712821861655 in words is "three trillion, seven hundred twelve billion, eight hundred twenty-one million, eight hundred sixty-one thousand, six hundred fifty-five".