77062827421 has 2 divisors, whose sum is σ = 77062827422. Its totient is φ = 77062827420.

The previous prime is 77062827419. The next prime is 77062827451. The reversal of 77062827421 is 12472826077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76311300025 + 751527396 = 276245^2 + 27414^2 .

It is an emirp because it is prime and its reverse (12472826077) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77062827421 - 2¹ = 77062827419 is a prime.

It is a super-2 number, since 2×77062827421² (a number of 23 digits) contains 22 as substring.

Together with 77062827419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77062827451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38531413710 + 38531413711.

It is an arithmetic number, because the mean of its divisors is an integer number (38531413711).

Almost surely, 2^77062827421 is an apocalyptic number.

It is an amenable number.

77062827421 is a deficient number, since it is larger than the sum of its proper divisors (1).

77062827421 is an equidigital number, since it uses as much as digits as its factorization.

77062827421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 526848, while the sum is 46.

The spelling of 77062827421 in words is "seventy-seven billion, sixty-two million, eight hundred twenty-seven thousand, four hundred twenty-one".