155606055561 has 32 divisors (see below), whose sum is σ = 253086422400. Its totient is φ = 93705992640.

The previous prime is 155606055559. The next prime is 155606055569. The reversal of 155606055561 is 165550606551.

It is not a de Polignac number, because 155606055561 - 2¹ = 155606055559 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155606055569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1621926 + ... + 1715183.

It is an arithmetic number, because the mean of its divisors is an integer number (7908950700).

Almost surely, 2^155606055561 is an apocalyptic number.

155606055561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155606055561 is a deficient number, since it is larger than the sum of its proper divisors (97480366839).

155606055561 is a wasteful number, since it uses less digits than its factorization.

155606055561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3337286 (or 3337280 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

The spelling of 155606055561 in words is "one hundred fifty-five billion, six hundred six million, fifty-five thousand, five hundred sixty-one".