2172656011 has 4 divisors (see below), whose sum is σ = 2188514952. Its totient is φ = 2156797072.

The previous prime is 2172655999. The next prime is 2172656027. The reversal of 2172656011 is 1106562712.

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

It is a cyclic number.

It is not a de Polignac number, because 2172656011 - 2¹³ = 2172647819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2172656411) 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, 7929265 + ... + 7929538.

It is an arithmetic number, because the mean of its divisors is an integer number (547128738).

Almost surely, 2^2172656011 is an apocalyptic number.

2172656011 is a deficient number, since it is larger than the sum of its proper divisors (15858941).

2172656011 is a wasteful number, since it uses less digits than its factorization.

2172656011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15858940.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 2172656011 is about 46611.7582912295. The cubic root of 2172656011 is about 1295.1805795597.

The spelling of 2172656011 in words is "two billion, one hundred seventy-two million, six hundred fifty-six thousand, eleven".