77466421 has 2 divisors, whose sum is σ = 77466422. Its totient is φ = 77466420.

The previous prime is 77466397. The next prime is 77466437. The reversal of 77466421 is 12466477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73102500 + 4363921 = 8550^2 + 2089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77466421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77466451) 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, 38733210 + 38733211.

It is an arithmetic number, because the mean of its divisors is an integer number (38733211).

Almost surely, 2^77466421 is an apocalyptic number.

It is an amenable number.

77466421 is a deficient number, since it is larger than the sum of its proper divisors (1).

77466421 is an equidigital number, since it uses as much as digits as its factorization.

77466421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 37.

The square root of 77466421 is about 8801.5010651593. The cubic root of 77466421 is about 426.2893641891.

The spelling of 77466421 in words is "seventy-seven million, four hundred sixty-six thousand, four hundred twenty-one".