7881764819 has 2 divisors, whose sum is σ = 7881764820. Its totient is φ = 7881764818.

The previous prime is 7881764809. The next prime is 7881764857. The reversal of 7881764819 is 9184671887.

7881764819 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7881764819 - 2¹⁶ = 7881699283 is a prime.

It is a super-2 number, since 2×7881764819² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7881764809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3940882409 + 3940882410.

It is an arithmetic number, because the mean of its divisors is an integer number (3940882410).

Almost surely, 2^7881764819 is an apocalyptic number.

7881764819 is a deficient number, since it is larger than the sum of its proper divisors (1).

7881764819 is an equidigital number, since it uses as much as digits as its factorization.

7881764819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5419008, while the sum is 59.

The square root of 7881764819 is about 88779.3040015521. The cubic root of 7881764819 is about 1990.0981255958.

The spelling of 7881764819 in words is "seven billion, eight hundred eighty-one million, seven hundred sixty-four thousand, eight hundred nineteen".