2447667521381 has 2 divisors, whose sum is σ = 2447667521382. Its totient is φ = 2447667521380.

The previous prime is 2447667521359. The next prime is 2447667521413. The reversal of 2447667521381 is 1831257667442.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1953551313025 + 494116208356 = 1397695^2 + 702934^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2447667521381 is a prime.

It is a super-2 number, since 2×2447667521381² (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 (2447667521281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1223833760690 + 1223833760691.

It is an arithmetic number, because the mean of its divisors is an integer number (1223833760691).

Almost surely, 2^{2447667521381} is an apocalyptic number.

It is an amenable number.

2447667521381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2447667521381 is an equidigital number, since it uses as much as digits as its factorization.

2447667521381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13547520, while the sum is 56.

The spelling of 2447667521381 in words is "two trillion, four hundred forty-seven billion, six hundred sixty-seven million, five hundred twenty-one thousand, three hundred eighty-one".