133665671437 has 2 divisors, whose sum is σ = 133665671438. Its totient is φ = 133665671436.

The previous prime is 133665671387. The next prime is 133665671449. The reversal of 133665671437 is 734176566331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133560280681 + 105390756 = 365459^2 + 10266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133665671437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133665671497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66832835718 + 66832835719.

It is an arithmetic number, because the mean of its divisors is an integer number (66832835719).

Almost surely, 2^133665671437 is an apocalyptic number.

It is an amenable number.

133665671437 is a deficient number, since it is larger than the sum of its proper divisors (1).

133665671437 is an equidigital number, since it uses as much as digits as its factorization.

133665671437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 52.

The spelling of 133665671437 in words is "one hundred thirty-three billion, six hundred sixty-five million, six hundred seventy-one thousand, four hundred thirty-seven".