55150817281 has 4 divisors (see below), whose sum is σ = 63029505472. Its totient is φ = 47272129092.

The previous prime is 55150817263. The next prime is 55150817297. The reversal of 55150817281 is 18271805155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55150817281 - 2²¹ = 55148720129 is a prime.

It is a super-2 number, since 2×55150817281² (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 (55150817261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3939344085 + ... + 3939344098.

It is an arithmetic number, because the mean of its divisors is an integer number (15757376368).

Almost surely, 2^55150817281 is an apocalyptic number.

It is an amenable number.

55150817281 is a deficient number, since it is larger than the sum of its proper divisors (7878688191).

55150817281 is an equidigital number, since it uses as much as digits as its factorization.

55150817281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7878688190.

The product of its (nonzero) digits is 112000, while the sum is 43.

The spelling of 55150817281 in words is "fifty-five billion, one hundred fifty million, eight hundred seventeen thousand, two hundred eighty-one".