76776775381 has 2 divisors, whose sum is σ = 76776775382. Its totient is φ = 76776775380.

The previous prime is 76776775373. The next prime is 76776775391. The reversal of 76776775381 is 18357767767.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73232478225 + 3544297156 = 270615^2 + 59534^2 .

It is a cyclic number.

It is not a de Polignac number, because 76776775381 - 2³ = 76776775373 is a prime.

It is a super-2 number, since 2×76776775381² (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 (76776775391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38388387690 + 38388387691.

It is an arithmetic number, because the mean of its divisors is an integer number (38388387691).

Almost surely, 2^76776775381 is an apocalyptic number.

It is an amenable number.

76776775381 is a deficient number, since it is larger than the sum of its proper divisors (1).

76776775381 is an equidigital number, since it uses as much as digits as its factorization.

76776775381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72606240, while the sum is 64.

The spelling of 76776775381 in words is "seventy-six billion, seven hundred seventy-six million, seven hundred seventy-five thousand, three hundred eighty-one".