155840563 has 2 divisors, whose sum is σ = 155840564. Its totient is φ = 155840562.

The previous prime is 155840533. The next prime is 155840609. The reversal of 155840563 is 365048551.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155840563 is a prime.

It is equal to p_8754166 and since 155840563 and 8754166 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (155840533) 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, 77920281 + 77920282.

It is an arithmetic number, because the mean of its divisors is an integer number (77920282).

Almost surely, 2^155840563 is an apocalyptic number.

155840563 is a deficient number, since it is larger than the sum of its proper divisors (1).

155840563 is an equidigital number, since it uses as much as digits as its factorization.

155840563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72000, while the sum is 37.

The square root of 155840563 is about 12483.6117770459. The cubic root of 155840563 is about 538.1378048341.

The spelling of 155840563 in words is "one hundred fifty-five million, eight hundred forty thousand, five hundred sixty-three".