155661005555 has 16 divisors (see below), whose sum is σ = 208513350144. Its totient is φ = 110575258080.

The previous prime is 155661005527. The next prime is 155661005567. The reversal of 155661005555 is 555500166551.

It is not a de Polignac number, because 155661005555 - 2¹² = 155661001459 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32906939 + ... + 32911668.

It is an arithmetic number, because the mean of its divisors is an integer number (13032084384).

Almost surely, 2^155661005555 is an apocalyptic number.

155661005555 is a deficient number, since it is larger than the sum of its proper divisors (52852344589).

155661005555 is a wasteful number, since it uses less digits than its factorization.

155661005555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65818666.

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

The spelling of 155661005555 in words is "one hundred fifty-five billion, six hundred sixty-one million, five thousand, five hundred fifty-five".