155947817049 has 4 divisors (see below), whose sum is σ = 207930422736. Its totient is φ = 103965211364.

The previous prime is 155947817041. The next prime is 155947817059. The reversal of 155947817049 is 940718749551.

155947817049 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155947817049 - 2³ = 155947817041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155947816983 and 155947817001.

It is not an unprimeable number, because it can be changed into a prime (155947817041) 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 3 ways as a sum of consecutive naturals, for example, 25991302839 + ... + 25991302844.

It is an arithmetic number, because the mean of its divisors is an integer number (51982605684).

Almost surely, 2^155947817049 is an apocalyptic number.

It is an amenable number.

155947817049 is a deficient number, since it is larger than the sum of its proper divisors (51982605687).

155947817049 is an equidigital number, since it uses as much as digits as its factorization.

155947817049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51982605686.

The product of its (nonzero) digits is 12700800, while the sum is 60.

The spelling of 155947817049 in words is "one hundred fifty-five billion, nine hundred forty-seven million, eight hundred seventeen thousand, forty-nine".