2177856813 has 16 divisors (see below), whose sum is σ = 3235193856. Its totient is φ = 1291829040.

The previous prime is 2177856803. The next prime is 2177856847. The reversal of 2177856813 is 3186587712.

It is a happy number.

It is not a de Polignac number, because 2177856813 - 2⁹ = 2177856301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2177856803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 700531 + ... + 703632.

It is an arithmetic number, because the mean of its divisors is an integer number (202199616).

Almost surely, 2^2177856813 is an apocalyptic number.

It is an amenable number.

2177856813 is a deficient number, since it is larger than the sum of its proper divisors (1057337043).

2177856813 is a wasteful number, since it uses less digits than its factorization.

2177856813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404224.

The product of its digits is 564480, while the sum is 48.

The square root of 2177856813 is about 46667.5134649362. The cubic root of 2177856813 is about 1296.2132035454.

The spelling of 2177856813 in words is "two billion, one hundred seventy-seven million, eight hundred fifty-six thousand, eight hundred thirteen".