77806451 has 2 divisors, whose sum is σ = 77806452. Its totient is φ = 77806450.

The previous prime is 77806361. The next prime is 77806453. The reversal of 77806451 is 15460877.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77806451 - 2¹⁸ = 77544307 is a prime.

It is a Sophie Germain prime.

Together with 77806453, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_4548881 and since 77806451 and 4548881 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (77806453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38903225 + 38903226.

It is an arithmetic number, because the mean of its divisors is an integer number (38903226).

Almost surely, 2^77806451 is an apocalyptic number.

77806451 is a deficient number, since it is larger than the sum of its proper divisors (1).

77806451 is an equidigital number, since it uses as much as digits as its factorization.

77806451 is an odious number, because the sum of its binary digits is odd.

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

The square root of 77806451 is about 8820.7965059852. The cubic root of 77806451 is about 426.9121699764.

The spelling of 77806451 in words is "seventy-seven million, eight hundred six thousand, four hundred fifty-one".