155986643 has 2 divisors, whose sum is σ = 155986644. Its totient is φ = 155986642.

The previous prime is 155986627. The next prime is 155986657. The reversal of 155986643 is 346689551.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155986643 - 2⁴ = 155986627 is a prime.

It is not a weakly prime, because it can be changed into another prime (155916643) 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, 77993321 + 77993322.

It is an arithmetic number, because the mean of its divisors is an integer number (77993322).

Almost surely, 2^155986643 is an apocalyptic number.

155986643 is a deficient number, since it is larger than the sum of its proper divisors (1).

155986643 is an equidigital number, since it uses as much as digits as its factorization.

155986643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777600, while the sum is 47.

The square root of 155986643 is about 12489.4612774130. The cubic root of 155986643 is about 538.3058967593.

The spelling of 155986643 in words is "one hundred fifty-five million, nine hundred eighty-six thousand, six hundred forty-three".