7881755551 has 2 divisors, whose sum is σ = 7881755552. Its totient is φ = 7881755550.

The previous prime is 7881755489. The next prime is 7881755587. The reversal of 7881755551 is 1555571887.

It is a strong prime.

It is an emirp because it is prime and its reverse (1555571887) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7881755551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7881756551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3940877775 + 3940877776.

It is an arithmetic number, because the mean of its divisors is an integer number (3940877776).

Almost surely, 2^7881755551 is an apocalyptic number.

7881755551 is a deficient number, since it is larger than the sum of its proper divisors (1).

7881755551 is an equidigital number, since it uses as much as digits as its factorization.

7881755551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1960000, while the sum is 52.

The square root of 7881755551 is about 88779.2518046869. The cubic root of 7881755551 is about 1990.0973455575.

The spelling of 7881755551 in words is "seven billion, eight hundred eighty-one million, seven hundred fifty-five thousand, five hundred fifty-one".