6904616387821 has 2 divisors, whose sum is σ = 6904616387822. Its totient is φ = 6904616387820.

The previous prime is 6904616387803. The next prime is 6904616387843. The reversal of 6904616387821 is 1287836164096.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6575070356100 + 329546031721 = 2564190^2 + 574061^2 .

It is a cyclic number.

It is not a de Polignac number, because 6904616387821 - 2³⁵ = 6870256649453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6904616387821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6904616387321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3452308193910 + 3452308193911.

It is an arithmetic number, because the mean of its divisors is an integer number (3452308193911).

Almost surely, 2^{6904616387821} is an apocalyptic number.

It is an amenable number.

6904616387821 is a deficient number, since it is larger than the sum of its proper divisors (1).

6904616387821 is an equidigital number, since it uses as much as digits as its factorization.

6904616387821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20901888, while the sum is 61.

The spelling of 6904616387821 in words is "six trillion, nine hundred four billion, six hundred sixteen million, three hundred eighty-seven thousand, eight hundred twenty-one".