2177138542871 has 4 divisors (see below), whose sum is σ = 2214039196200. Its totient is φ = 2140237889544.

The previous prime is 2177138542849. The next prime is 2177138542927. The reversal of 2177138542871 is 1782458317712.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2177138542871 is a prime.

It is a super-2 number, since 2×2177138542871² (a number of 25 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 (2177138542811) 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, 18450326576 + ... + 18450326693.

It is an arithmetic number, because the mean of its divisors is an integer number (553509799050).

Almost surely, 2^{2177138542871} is an apocalyptic number.

2177138542871 is a deficient number, since it is larger than the sum of its proper divisors (36900653329).

2177138542871 is an equidigital number, since it uses as much as digits as its factorization.

2177138542871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36900653328.

The product of its digits is 5268480, while the sum is 56.

The spelling of 2177138542871 in words is "two trillion, one hundred seventy-seven billion, one hundred thirty-eight million, five hundred forty-two thousand, eight hundred seventy-one".