77352479381 has 2 divisors, whose sum is σ = 77352479382. Its totient is φ = 77352479380.

The previous prime is 77352479363. The next prime is 77352479419. The reversal of 77352479381 is 18397425377.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72648577156 + 4703902225 = 269534^2 + 68585^2 .

It is an emirp because it is prime and its reverse (18397425377) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77352479381 is a prime.

It is a super-2 number, since 2×77352479381² (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 (77352479311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38676239690 + 38676239691.

It is an arithmetic number, because the mean of its divisors is an integer number (38676239691).

Almost surely, 2^77352479381 is an apocalyptic number.

It is an amenable number.

77352479381 is a deficient number, since it is larger than the sum of its proper divisors (1).

77352479381 is an equidigital number, since it uses as much as digits as its factorization.

77352479381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8890560, while the sum is 56.

The spelling of 77352479381 in words is "seventy-seven billion, three hundred fifty-two million, four hundred seventy-nine thousand, three hundred eighty-one".