4255831780621 has 2 divisors, whose sum is σ = 4255831780622. Its totient is φ = 4255831780620.

The previous prime is 4255831780561. The next prime is 4255831780639. The reversal of 4255831780621 is 1260871385524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4006346515396 + 249485265225 = 2001586^2 + 499485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4255831780621 is a prime.

It is a super-2 number, since 2×4255831780621² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4255831780661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2127915890310 + 2127915890311.

It is an arithmetic number, because the mean of its divisors is an integer number (2127915890311).

Almost surely, 2^{4255831780621} is an apocalyptic number.

It is an amenable number.

4255831780621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4255831780621 is an equidigital number, since it uses as much as digits as its factorization.

4255831780621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3225600, while the sum is 52.

The spelling of 4255831780621 in words is "four trillion, two hundred fifty-five billion, eight hundred thirty-one million, seven hundred eighty thousand, six hundred twenty-one".