2170172656 has 10 divisors (see below), whose sum is σ = 4204709552. Its totient is φ = 1085086320.

The previous prime is 2170172623. The next prime is 2170172657. The reversal of 2170172656 is 6562710712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2170172657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67817880 + ... + 67817911.

Almost surely, 2^2170172656 is an apocalyptic number.

It is an amenable number.

2170172656 is a deficient number, since it is larger than the sum of its proper divisors (2034536896).

2170172656 is a wasteful number, since it uses less digits than its factorization.

2170172656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135635799 (or 135635793 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 2170172656 is about 46585.1119565039. Note that the first 3 decimals coincide. The cubic root of 2170172656 is about 1294.6869258043.

The spelling of 2170172656 in words is "two billion, one hundred seventy million, one hundred seventy-two thousand, six hundred fifty-six".