2172080186991 has 64 divisors (see below), whose sum is σ = 3800055114240. Its totient is φ = 1208853227520.

The previous prime is 2172080186963. The next prime is 2172080186999. The reversal of 2172080186991 is 1996810802712.

It is a happy number.

It is not a de Polignac number, because 2172080186991 - 2¹⁷ = 2172080055919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172080186999) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 712261 + ... + 2202606.

It is an arithmetic number, because the mean of its divisors is an integer number (59375861160).

Almost surely, 2^{2172080186991} is an apocalyptic number.

2172080186991 is a deficient number, since it is larger than the sum of its proper divisors (1627974927249).

2172080186991 is a wasteful number, since it uses less digits than its factorization.

2172080186991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915093 (or 2915087 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 54.

The spelling of 2172080186991 in words is "two trillion, one hundred seventy-two billion, eighty million, one hundred eighty-six thousand, nine hundred ninety-one".