77614152221 has 2 divisors, whose sum is σ = 77614152222. Its totient is φ = 77614152220.

The previous prime is 77614152191. The next prime is 77614152269. The reversal of 77614152221 is 12225141677.

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., 53354532196 + 24259620025 = 230986^2 + 155755^2 .

It is a cyclic number.

It is not a de Polignac number, because 77614152221 - 2²² = 77609957917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77614151221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38807076110 + 38807076111.

It is an arithmetic number, because the mean of its divisors is an integer number (38807076111).

Almost surely, 2^77614152221 is an apocalyptic number.

It is an amenable number.

77614152221 is a deficient number, since it is larger than the sum of its proper divisors (1).

77614152221 is an equidigital number, since it uses as much as digits as its factorization.

77614152221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 38.

Adding to 77614152221 its reverse (12225141677), we get a palindrome (89839293898).

The spelling of 77614152221 in words is "seventy-seven billion, six hundred fourteen million, one hundred fifty-two thousand, two hundred twenty-one".