2156672011 has 4 divisors (see below), whose sum is σ = 2322569872. Its totient is φ = 1990774152.

The previous prime is 2156671997. The next prime is 2156672047. The reversal of 2156672011 is 1102766512.

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-2156672011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2156672051) 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, 82948911 + ... + 82948936.

It is an arithmetic number, because the mean of its divisors is an integer number (580642468).

Almost surely, 2^2156672011 is an apocalyptic number.

2156672011 is a deficient number, since it is larger than the sum of its proper divisors (165897861).

2156672011 is a wasteful number, since it uses less digits than its factorization.

2156672011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165897860.

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

The square root of 2156672011 is about 46439.9828919004. The cubic root of 2156672011 is about 1291.9965899053.

The spelling of 2156672011 in words is "two billion, one hundred fifty-six million, six hundred seventy-two thousand, eleven".