3781998966853 has 2 divisors, whose sum is σ = 3781998966854. Its totient is φ = 3781998966852.

The previous prime is 3781998966761. The next prime is 3781998966883. The reversal of 3781998966853 is 3586698991873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2029875519169 + 1752123447684 = 1424737^2 + 1323678^2 .

It is a cyclic number.

It is not a de Polignac number, because 3781998966853 - 2¹⁷ = 3781998835781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3781998966883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1890999483426 + 1890999483427.

It is an arithmetic number, because the mean of its divisors is an integer number (1890999483427).

Almost surely, 2^{3781998966853} is an apocalyptic number.

It is an amenable number.

3781998966853 is a deficient number, since it is larger than the sum of its proper divisors (1).

3781998966853 is an equidigital number, since it uses as much as digits as its factorization.

3781998966853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4232632320, while the sum is 82.

The spelling of 3781998966853 in words is "three trillion, seven hundred eighty-one billion, nine hundred ninety-eight million, nine hundred sixty-six thousand, eight hundred fifty-three".