77446672909 has 2 divisors, whose sum is σ = 77446672910. Its totient is φ = 77446672908.

The previous prime is 77446672879. The next prime is 77446672937. The reversal of 77446672909 is 90927664477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52496890884 + 24949782025 = 229122^2 + 157955^2 .

It is a cyclic number.

It is not a de Polignac number, because 77446672909 - 2⁹ = 77446672397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77446672609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38723336454 + 38723336455.

It is an arithmetic number, because the mean of its divisors is an integer number (38723336455).

Almost surely, 2^77446672909 is an apocalyptic number.

It is an amenable number.

77446672909 is a deficient number, since it is larger than the sum of its proper divisors (1).

77446672909 is an equidigital number, since it uses as much as digits as its factorization.

77446672909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32006016, while the sum is 61.

The spelling of 77446672909 in words is "seventy-seven billion, four hundred forty-six million, six hundred seventy-two thousand, nine hundred nine".