155205311949 has 8 divisors (see below), whose sum is σ = 229933795520. Its totient is φ = 103470207948.

The previous prime is 155205311873. The next prime is 155205311969. The reversal of 155205311949 is 949113502551.

155205311949 is a `hidden beast` number, since 1 + 5 + 5 + 20 + 531 + 1 + 94 + 9 = 666.

155205311949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 155205311949 - 2⁸ = 155205311693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155205311969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2874172417 + ... + 2874172470.

It is an arithmetic number, because the mean of its divisors is an integer number (28741724440).

Almost surely, 2^155205311949 is an apocalyptic number.

It is an amenable number.

155205311949 is a deficient number, since it is larger than the sum of its proper divisors (74728483571).

155205311949 is an equidigital number, since it uses as much as digits as its factorization.

155205311949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5748344896 (or 5748344890 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 45.

The spelling of 155205311949 in words is "one hundred fifty-five billion, two hundred five million, three hundred eleven thousand, nine hundred forty-nine".