155638433 has 2 divisors, whose sum is σ = 155638434. Its totient is φ = 155638432.

The previous prime is 155638423. The next prime is 155638477. The reversal of 155638433 is 334836551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145250704 + 10387729 = 12052^2 + 3223^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155638433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155638423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77819216 + 77819217.

It is an arithmetic number, because the mean of its divisors is an integer number (77819217).

Almost surely, 2^155638433 is an apocalyptic number.

It is an amenable number.

155638433 is a deficient number, since it is larger than the sum of its proper divisors (1).

155638433 is an equidigital number, since it uses as much as digits as its factorization.

155638433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 38.

The square root of 155638433 is about 12475.5133361317. The cubic root of 155638433 is about 537.9050437482.

The spelling of 155638433 in words is "one hundred fifty-five million, six hundred thirty-eight thousand, four hundred thirty-three".