100561551555609 has 80 divisors (see below), whose sum is σ = 160924570418304. Its totient is φ = 62426421446400.

The previous prime is 100561551555607. The next prime is 100561551555623. The reversal of 100561551555609 is 906555155165001.

100561551555609 is a `hidden beast` number, since 1 + 0 + 0 + 5 + 6 + 15 + 5 + 15 + 5 + 5 + 609 = 666.

It is not a de Polignac number, because 100561551555609 - 2¹ = 100561551555607 is a prime.

It is a super-2 number, since 2×100561551555609² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (100561551555607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 33784642 + ... + 36640484.

Almost surely, 2^{100561551555609} is an apocalyptic number.

It is an amenable number.

100561551555609 is a deficient number, since it is larger than the sum of its proper divisors (60363018862695).

100561551555609 is a wasteful number, since it uses less digits than its factorization.

100561551555609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2856380 (or 2856371 counting only the distinct ones).

The product of its (nonzero) digits is 5062500, while the sum is 54.

The spelling of 100561551555609 in words is "one hundred trillion, five hundred sixty-one billion, five hundred fifty-one million, five hundred fifty-five thousand, six hundred nine".