77215693427 has 2 divisors, whose sum is σ = 77215693428. Its totient is φ = 77215693426.

The previous prime is 77215693417. The next prime is 77215693441. The reversal of 77215693427 is 72439651277.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77215693427 - 2⁶ = 77215693363 is a prime.

It is a super-2 number, since 2×77215693427² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77215693417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38607846713 + 38607846714.

It is an arithmetic number, because the mean of its divisors is an integer number (38607846714).

Almost surely, 2^77215693427 is an apocalyptic number.

77215693427 is a deficient number, since it is larger than the sum of its proper divisors (1).

77215693427 is an equidigital number, since it uses as much as digits as its factorization.

77215693427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4445280, while the sum is 53.

The spelling of 77215693427 in words is "seventy-seven billion, two hundred fifteen million, six hundred ninety-three thousand, four hundred twenty-seven".