76878783221 has 2 divisors, whose sum is σ = 76878783222. Its totient is φ = 76878783220.

The previous prime is 76878783209. The next prime is 76878783227. The reversal of 76878783221 is 12238787867.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76878652900 + 130321 = 277270^2 + 361^2 .

It is a cyclic number.

It is not a de Polignac number, because 76878783221 - 2¹⁸ = 76878521077 is a prime.

It is a super-2 number, since 2×76878783221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76878783227) 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, 38439391610 + 38439391611.

It is an arithmetic number, because the mean of its divisors is an integer number (38439391611).

Almost surely, 2^76878783221 is an apocalyptic number.

It is an amenable number.

76878783221 is a deficient number, since it is larger than the sum of its proper divisors (1).

76878783221 is an equidigital number, since it uses as much as digits as its factorization.

76878783221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12644352, while the sum is 59.

The spelling of 76878783221 in words is "seventy-six billion, eight hundred seventy-eight million, seven hundred eighty-three thousand, two hundred twenty-one".