77376473821 has 2 divisors, whose sum is σ = 77376473822. Its totient is φ = 77376473820.

The previous prime is 77376473819. The next prime is 77376473831. The reversal of 77376473821 is 12837467377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63245208196 + 14131265625 = 251486^2 + 118875^2 .

It is a cyclic number.

It is not a de Polignac number, because 77376473821 - 2¹ = 77376473819 is a prime.

Together with 77376473819, 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 (77376473831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38688236910 + 38688236911.

It is an arithmetic number, because the mean of its divisors is an integer number (38688236911).

Almost surely, 2^77376473821 is an apocalyptic number.

It is an amenable number.

77376473821 is a deficient number, since it is larger than the sum of its proper divisors (1).

77376473821 is an equidigital number, since it uses as much as digits as its factorization.

77376473821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8297856, while the sum is 55.

The spelling of 77376473821 in words is "seventy-seven billion, three hundred seventy-six million, four hundred seventy-three thousand, eight hundred twenty-one".