6415220269781 has 2 divisors, whose sum is σ = 6415220269782. Its totient is φ = 6415220269780.

The previous prime is 6415220269753. The next prime is 6415220269817. The reversal of 6415220269781 is 1879620225146.

Together with next prime (6415220269817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5200265207281 + 1214955062500 = 2280409^2 + 1102250^2 .

It is a cyclic number.

It is not a de Polignac number, because 6415220269781 - 2²⁶ = 6415153160917 is a prime.

It is a super-2 number, since 2×6415220269781² (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 (6415220269721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3207610134890 + 3207610134891.

It is an arithmetic number, because the mean of its divisors is an integer number (3207610134891).

Almost surely, 2^{6415220269781} is an apocalyptic number.

It is an amenable number.

6415220269781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6415220269781 is an equidigital number, since it uses as much as digits as its factorization.

6415220269781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 6415220269781 in words is "six trillion, four hundred fifteen billion, two hundred twenty million, two hundred sixty-nine thousand, seven hundred eighty-one".