77252054221 has 2 divisors, whose sum is σ = 77252054222. Its totient is φ = 77252054220.

The previous prime is 77252054213. The next prime is 77252054233. The reversal of 77252054221 is 12245025277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77178951721 + 73102500 = 277811^2 + 8550^2 .

It is a cyclic number.

It is not a de Polignac number, because 77252054221 - 2³ = 77252054213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77252054261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38626027110 + 38626027111.

It is an arithmetic number, because the mean of its divisors is an integer number (38626027111).

Almost surely, 2^77252054221 is an apocalyptic number.

It is an amenable number.

77252054221 is a deficient number, since it is larger than the sum of its proper divisors (1).

77252054221 is an equidigital number, since it uses as much as digits as its factorization.

77252054221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78400, while the sum is 37.

Adding to 77252054221 its reverse (12245025277), we get a palindrome (89497079498).

The spelling of 77252054221 in words is "seventy-seven billion, two hundred fifty-two million, fifty-four thousand, two hundred twenty-one".