155506105503 has 24 divisors (see below), whose sum is σ = 266216216448. Its totient is φ = 88860630744.

The previous prime is 155506105501. The next prime is 155506105607. The reversal of 155506105503 is 305501605551.

155506105503 is a `hidden beast` number, since 1 + 55 + 50 + 6 + 1 + 0 + 550 + 3 = 666.

It is not a de Polignac number, because 155506105503 - 2¹ = 155506105501 is a prime.

It is a super-3 number, since 3×155506105503³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155506105501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45708501 + ... + 45711902.

It is an arithmetic number, because the mean of its divisors is an integer number (11092342352).

Almost surely, 2^155506105503 is an apocalyptic number.

155506105503 is a deficient number, since it is larger than the sum of its proper divisors (110710110945).

155506105503 is an frugal number, since it uses more digits than its factorization.

155506105503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91420425 (or 91420413 counting only the distinct ones).

The product of its (nonzero) digits is 56250, while the sum is 36.

The spelling of 155506105503 in words is "one hundred fifty-five billion, five hundred six million, one hundred five thousand, five hundred three".