2177138542868 has 12 divisors (see below), whose sum is σ = 3975644295840. Its totient is φ = 1041240172632.

The previous prime is 2177138542849. The next prime is 2177138542927. The reversal of 2177138542868 is 8682458317712.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2177138542868.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11832274598 + ... + 11832274781.

It is an arithmetic number, because the mean of its divisors is an integer number (331303691320).

Almost surely, 2^{2177138542868} is an apocalyptic number.

It is an amenable number.

2177138542868 is a deficient number, since it is larger than the sum of its proper divisors (1798505752972).

2177138542868 is a wasteful number, since it uses less digits than its factorization.

2177138542868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23664549406 (or 23664549404 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 62.

The spelling of 2177138542868 in words is "two trillion, one hundred seventy-seven billion, one hundred thirty-eight million, five hundred forty-two thousand, eight hundred sixty-eight".