155803478889 has 4 divisors (see below), whose sum is σ = 207737971856. Its totient is φ = 103868985924.

The previous prime is 155803478867. The next prime is 155803478903. The reversal of 155803478889 is 988874308551.

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 not a de Polignac number, because 155803478889 - 2²³ = 155795090281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155803478849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25967246479 + ... + 25967246484.

It is an arithmetic number, because the mean of its divisors is an integer number (51934492964).

Almost surely, 2^155803478889 is an apocalyptic number.

It is an amenable number.

155803478889 is a deficient number, since it is larger than the sum of its proper divisors (51934492967).

155803478889 is an equidigital number, since it uses as much as digits as its factorization.

155803478889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51934492966.

The product of its (nonzero) digits is 77414400, while the sum is 66.

The spelling of 155803478889 in words is "one hundred fifty-five billion, eight hundred three million, four hundred seventy-eight thousand, eight hundred eighty-nine".