155605051655 has 4 divisors (see below), whose sum is σ = 186726061992. Its totient is φ = 124484041320.

The previous prime is 155605051649. The next prime is 155605051687. The reversal of 155605051655 is 556150506551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 556150506551 = 31 ⋅17940338921.

It is not a de Polignac number, because 155605051655 - 2¹⁰ = 155605050631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15560505161 + ... + 15560505170.

It is an arithmetic number, because the mean of its divisors is an integer number (46681515498).

Almost surely, 2^155605051655 is an apocalyptic number.

155605051655 is a deficient number, since it is larger than the sum of its proper divisors (31121010337).

155605051655 is an equidigital number, since it uses as much as digits as its factorization.

155605051655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31121010336.

The product of its (nonzero) digits is 562500, while the sum is 44.

The spelling of 155605051655 in words is "one hundred fifty-five billion, six hundred five million, fifty-one thousand, six hundred fifty-five".