155811807838 has 8 divisors (see below), whose sum is σ = 233723320488. Its totient is φ = 77904034344.

The previous prime is 155811807793. The next prime is 155811807847. The reversal of 155811807838 is 838708118551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 828181 + ... + 998752.

It is an arithmetic number, because the mean of its divisors is an integer number (29215415061).

Almost surely, 2^155811807838 is an apocalyptic number.

155811807838 is a deficient number, since it is larger than the sum of its proper divisors (77911512650).

155811807838 is a wasteful number, since it uses less digits than its factorization.

155811807838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1869578.

The product of its (nonzero) digits is 2150400, while the sum is 55.

The spelling of 155811807838 in words is "one hundred fifty-five billion, eight hundred eleven million, eight hundred seven thousand, eight hundred thirty-eight".