6449891494451 has 2 divisors, whose sum is σ = 6449891494452. Its totient is φ = 6449891494450.

The previous prime is 6449891494421. The next prime is 6449891494463. The reversal of 6449891494451 is 1544941989446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6449891494451 - 2¹⁴ = 6449891478067 is a prime.

It is a super-2 number, since 2×6449891494451² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6449891494421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3224945747225 + 3224945747226.

It is an arithmetic number, because the mean of its divisors is an integer number (3224945747226).

Almost surely, 2^{6449891494451} is an apocalyptic number.

6449891494451 is a deficient number, since it is larger than the sum of its proper divisors (1).

6449891494451 is an equidigital number, since it uses as much as digits as its factorization.

6449891494451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 179159040, while the sum is 68.

The spelling of 6449891494451 in words is "six trillion, four hundred forty-nine billion, eight hundred ninety-one million, four hundred ninety-four thousand, four hundred fifty-one".