155555606555551 has 8 divisors (see below), whose sum is σ = 156822385448960. Its totient is φ = 154289482843608.

The previous prime is 155555606555549. The next prime is 155555606555599.

155555606555551 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 155555606555551 - 2¹ = 155555606555549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155555606555501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163318581 + ... + 164268286.

It is an arithmetic number, because the mean of its divisors is an integer number (19602798181120).

Almost surely, 2^{155555606555551} is an apocalyptic number.

155555606555551 is a deficient number, since it is larger than the sum of its proper divisors (1266778893409).

155555606555551 is a wasteful number, since it uses less digits than its factorization.

155555606555551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327590733.

The product of its (nonzero) digits is 351562500, while the sum is 64.

The spelling of 155555606555551 in words is "one hundred fifty-five trillion, five hundred fifty-five billion, six hundred six million, five hundred fifty-five thousand, five hundred fifty-one".