155638673 has 2 divisors, whose sum is σ = 155638674. Its totient is φ = 155638672.

The previous prime is 155638663. The next prime is 155638697. The reversal of 155638673 is 376836551.

155638673 is digitally balanced in base 2, 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., 139901584 + 15737089 = 11828^2 + 3967^2 .

It is a cyclic number.

It is not a de Polignac number, because 155638673 - 2⁴ = 155638657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (155638643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77819336 + 77819337.

It is an arithmetic number, because the mean of its divisors is an integer number (77819337).

Almost surely, 2^155638673 is an apocalyptic number.

It is an amenable number.

155638673 is a deficient number, since it is larger than the sum of its proper divisors (1).

155638673 is an equidigital number, since it uses as much as digits as its factorization.

155638673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 44.

The square root of 155638673 is about 12475.5229549707. The cubic root of 155638673 is about 537.9053202376.

The spelling of 155638673 in words is "one hundred fifty-five million, six hundred thirty-eight thousand, six hundred seventy-three".