4002956255821 has 2 divisors, whose sum is σ = 4002956255822. Its totient is φ = 4002956255820.

The previous prime is 4002956255789. The next prime is 4002956255861. The reversal of 4002956255821 is 1285526592004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3480929775625 + 522026480196 = 1865725^2 + 722514^2 .

It is a cyclic number.

It is not a de Polignac number, because 4002956255821 - 2⁵ = 4002956255789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4002956255861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2001478127910 + 2001478127911.

It is an arithmetic number, because the mean of its divisors is an integer number (2001478127911).

Almost surely, 2^{4002956255821} is an apocalyptic number.

It is an amenable number.

4002956255821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4002956255821 is an equidigital number, since it uses as much as digits as its factorization.

4002956255821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728000, while the sum is 49.

The spelling of 4002956255821 in words is "four trillion, two billion, nine hundred fifty-six million, two hundred fifty-five thousand, eight hundred twenty-one".