2661938239 has 2 divisors, whose sum is σ = 2661938240. Its totient is φ = 2661938238.

The previous prime is 2661938179. The next prime is 2661938261. The reversal of 2661938239 is 9328391662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2661938239 - 2⁹ = 2661937727 is a prime.

It is a super-2 number, since 2×2661938239² = 14171830376500842242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2661938192 and 2661938201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661938299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330969119 + 1330969120.

It is an arithmetic number, because the mean of its divisors is an integer number (1330969120).

Almost surely, 2^2661938239 is an apocalyptic number.

2661938239 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661938239 is an equidigital number, since it uses as much as digits as its factorization.

2661938239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 49.

The square root of 2661938239 is about 51593.9748323387. The cubic root of 2661938239 is about 1385.9024366219.

It can be divided in two parts, 2661 and 938239, that added together give a square (940900 = 970²).

The spelling of 2661938239 in words is "two billion, six hundred sixty-one million, nine hundred thirty-eight thousand, two hundred thirty-nine".