155943694019 has 2 divisors, whose sum is σ = 155943694020. Its totient is φ = 155943694018.

The previous prime is 155943694013. The next prime is 155943694031. The reversal of 155943694019 is 910496349551.

It is a weak prime.

It is an emirp because it is prime and its reverse (910496349551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155943694019 is a prime.

It is a super-2 number, since 2×155943694019² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155943694013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77971847009 + 77971847010.

It is an arithmetic number, because the mean of its divisors is an integer number (77971847010).

Almost surely, 2^155943694019 is an apocalyptic number.

155943694019 is a deficient number, since it is larger than the sum of its proper divisors (1).

155943694019 is an equidigital number, since it uses as much as digits as its factorization.

155943694019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5248800, while the sum is 56.

The spelling of 155943694019 in words is "one hundred fifty-five billion, nine hundred forty-three million, six hundred ninety-four thousand, nineteen".