55123146871 has 4 divisors (see below), whose sum is σ = 59363388952. Its totient is φ = 50882904792.

The previous prime is 55123146847. The next prime is 55123146941. The reversal of 55123146871 is 17864132155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17864132155 = 5 ⋅3572826431.

It is a cyclic number.

It is not a de Polignac number, because 55123146871 - 2¹⁵ = 55123114103 is a prime.

It is a super-2 number, since 2×55123146871² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55123146271) 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, 2120121021 + ... + 2120121046.

It is an arithmetic number, because the mean of its divisors is an integer number (14840847238).

Almost surely, 2^55123146871 is an apocalyptic number.

55123146871 is a deficient number, since it is larger than the sum of its proper divisors (4240242081).

55123146871 is a wasteful number, since it uses less digits than its factorization.

55123146871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4240242080.

The product of its digits is 201600, while the sum is 43.

The spelling of 55123146871 in words is "fifty-five billion, one hundred twenty-three million, one hundred forty-six thousand, eight hundred seventy-one".