155639648438 has 4 divisors (see below), whose sum is σ = 233459472660. Its totient is φ = 77819824218.

The previous prime is 155639648419. The next prime is 155639648459. The reversal of 155639648438 is 834846936551.

It is a semiprime because it is the product of two 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 as a sum of consecutive naturals, namely, 38909912108 + ... + 38909912111.

It is an arithmetic number, because the mean of its divisors is an integer number (58364868165).

Almost surely, 2^155639648438 is an apocalyptic number.

155639648438 is a deficient number, since it is larger than the sum of its proper divisors (77819824222).

155639648438 is an equidigital number, since it uses as much as digits as its factorization.

155639648438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77819824221.

The product of its digits is 74649600, while the sum is 62.

The spelling of 155639648438 in words is "one hundred fifty-five billion, six hundred thirty-nine million, six hundred forty-eight thousand, four hundred thirty-eight".