6215425746991 has 2 divisors, whose sum is σ = 6215425746992. Its totient is φ = 6215425746990.

The previous prime is 6215425746949. The next prime is 6215425747057. The reversal of 6215425746991 is 1996475245126.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6215425746991 - 2²⁷ = 6215291529263 is a prime.

It is a super-3 number, since 3×6215425746991³ (a number of 39 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6215425746091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3107712873495 + 3107712873496.

It is an arithmetic number, because the mean of its divisors is an integer number (3107712873496).

Almost surely, 2^{6215425746991} is an apocalyptic number.

6215425746991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6215425746991 is an equidigital number, since it uses as much as digits as its factorization.

6215425746991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32659200, while the sum is 61.

The spelling of 6215425746991 in words is "six trillion, two hundred fifteen billion, four hundred twenty-five million, seven hundred forty-six thousand, nine hundred ninety-one".