155661515655 has 32 divisors (see below), whose sum is σ = 259959075840. Its totient is φ = 79387925760.

The previous prime is 155661515629. The next prime is 155661515657. The reversal of 155661515655 is 556515166551.

155661515655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 155661515655 - 2¹⁷ = 155661384583 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155661515598 and 155661515607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155661515657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1222395 + ... + 1343715.

It is an arithmetic number, because the mean of its divisors is an integer number (8123721120).

Almost surely, 2^155661515655 is an apocalyptic number.

155661515655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155661515655 is a deficient number, since it is larger than the sum of its proper divisors (104297560185).

155661515655 is a wasteful number, since it uses less digits than its factorization.

155661515655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125071.

The product of its digits is 3375000, while the sum is 51.

The spelling of 155661515655 in words is "one hundred fifty-five billion, six hundred sixty-one million, five hundred fifteen thousand, six hundred fifty-five".