1631162666381 has 2 divisors, whose sum is σ = 1631162666382. Its totient is φ = 1631162666380.

The previous prime is 1631162666303. The next prime is 1631162666417. The reversal of 1631162666381 is 1836662611361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 875036768356 + 756125898025 = 935434^2 + 869555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1631162666381 is a prime.

It is a super-2 number, since 2×1631162666381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1631162666981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815581333190 + 815581333191.

It is an arithmetic number, because the mean of its divisors is an integer number (815581333191).

Almost surely, 2^{1631162666381} is an apocalyptic number.

It is an amenable number.

1631162666381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631162666381 is an equidigital number, since it uses as much as digits as its factorization.

1631162666381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 50.

The spelling of 1631162666381 in words is "one trillion, six hundred thirty-one billion, one hundred sixty-two million, six hundred sixty-six thousand, three hundred eighty-one".