155203638027 has 16 divisors (see below), whose sum is σ = 209749731840. Its totient is φ = 102065719392.

The previous prime is 155203638001. The next prime is 155203638041. The reversal of 155203638027 is 720836302551.

It is a happy number.

It is not a de Polignac number, because 155203638027 - 2²⁴ = 155186860811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155203638027.

It is not an unprimeable number, because it can be changed into a prime (155203638047) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 40533 + ... + 558614.

It is an arithmetic number, because the mean of its divisors is an integer number (13109358240).

Almost surely, 2^155203638027 is an apocalyptic number.

155203638027 is a deficient number, since it is larger than the sum of its proper divisors (54546093813).

155203638027 is a wasteful number, since it uses less digits than its factorization.

155203638027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600322.

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 155203638027 in words is "one hundred fifty-five billion, two hundred three million, six hundred thirty-eight thousand, twenty-seven".