6433157681 has 2 divisors, whose sum is σ = 6433157682. Its totient is φ = 6433157680.

The previous prime is 6433157659. The next prime is 6433157723. The reversal of 6433157681 is 1867513346.

6433157681 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5052366400 + 1380791281 = 71080^2 + 37159^2 .

It is a cyclic number.

It is not a de Polignac number, because 6433157681 - 2¹⁸ = 6432895537 is a prime.

It is a super-2 number, since 2×6433157681² = 82771035497218595522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6433157611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3216578840 + 3216578841.

It is an arithmetic number, because the mean of its divisors is an integer number (3216578841).

Almost surely, 2^6433157681 is an apocalyptic number.

It is an amenable number.

6433157681 is a deficient number, since it is larger than the sum of its proper divisors (1).

6433157681 is an equidigital number, since it uses as much as digits as its factorization.

6433157681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 44.

The square root of 6433157681 is about 80206.9677833541. The cubic root of 6433157681 is about 1859.8363521379.

The spelling of 6433157681 in words is "six billion, four hundred thirty-three million, one hundred fifty-seven thousand, six hundred eighty-one".