155606561555 has 8 divisors (see below), whose sum is σ = 186731283312. Its totient is φ = 124482976288.

The previous prime is 155606561423. The next prime is 155606561573. The reversal of 155606561555 is 555165606551.

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 155606561555 - 2¹² = 155606557459 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53597 + ... + 560433.

It is an arithmetic number, because the mean of its divisors is an integer number (23341410414).

Almost surely, 2^155606561555 is an apocalyptic number.

155606561555 is a deficient number, since it is larger than the sum of its proper divisors (31124721757).

155606561555 is an equidigital number, since it uses as much as digits as its factorization.

155606561555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568245.

The product of its (nonzero) digits is 3375000, while the sum is 50.

The spelling of 155606561555 in words is "one hundred fifty-five billion, six hundred six million, five hundred sixty-one thousand, five hundred fifty-five".