2158663849 has 2 divisors, whose sum is σ = 2158663850. Its totient is φ = 2158663848.

The previous prime is 2158663847. The next prime is 2158663909. The reversal of 2158663849 is 9483668512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1679360400 + 479303449 = 40980^2 + 21893^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158663849 - 2¹ = 2158663847 is a prime.

It is a super-2 number, since 2×2158663849² = 9319659225958989602, which contains 22 as substring.

Together with 2158663847, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2158663796 and 2158663805.

It is not a weakly prime, because it can be changed into another prime (2158663847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079331924 + 1079331925.

It is an arithmetic number, because the mean of its divisors is an integer number (1079331925).

Almost surely, 2^2158663849 is an apocalyptic number.

It is an amenable number.

2158663849 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158663849 is an equidigital number, since it uses as much as digits as its factorization.

2158663849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2488320, while the sum is 52.

The square root of 2158663849 is about 46461.4232347654. The cubic root of 2158663849 is about 1292.3942173676.

It can be divided in two parts, 2158663 and 849, that added together give a palindrome (2159512).

The spelling of 2158663849 in words is "two billion, one hundred fifty-eight million, six hundred sixty-three thousand, eight hundred forty-nine".