1820662117 has 4 divisors (see below), whose sum is σ = 1820855520. Its totient is φ = 1820468716.

The previous prime is 1820662111. The next prime is 1820662133. The reversal of 1820662117 is 7112660281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7112660281 = 1163 ⋅6115787.

It is a cyclic number.

It is not a de Polignac number, because 1820662117 - 2¹¹ = 1820660069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820662111) 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, 81817 + ... + 101662.

It is an arithmetic number, because the mean of its divisors is an integer number (455213880).

Almost surely, 2^1820662117 is an apocalyptic number.

It is an amenable number.

1820662117 is a deficient number, since it is larger than the sum of its proper divisors (193403).

1820662117 is an equidigital number, since it uses as much as digits as its factorization.

1820662117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193402.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 1820662117 is about 42669.2174406796. The cubic root of 1820662117 is about 1221.0771900277.

The spelling of 1820662117 in words is "one billion, eight hundred twenty million, six hundred sixty-two thousand, one hundred seventeen".