55011109987 has 4 divisors (see below), whose sum is σ = 55020492216. Its totient is φ = 55001727760.

The previous prime is 55011109943. The next prime is 55011109991. The reversal of 55011109987 is 78990111055.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55011109987 - 2²³ = 55002721379 is a prime.

It is a super-2 number, since 2×55011109987² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55011109187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4682314 + ... + 4694047.

It is an arithmetic number, because the mean of its divisors is an integer number (13755123054).

Almost surely, 2^55011109987 is an apocalyptic number.

55011109987 is a deficient number, since it is larger than the sum of its proper divisors (9382229).

55011109987 is an equidigital number, since it uses as much as digits as its factorization.

55011109987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9382228.

The product of its (nonzero) digits is 113400, while the sum is 46.

The spelling of 55011109987 in words is "fifty-five billion, eleven million, one hundred nine thousand, nine hundred eighty-seven".