77403081409 has 2 divisors, whose sum is σ = 77403081410. Its totient is φ = 77403081408.

The previous prime is 77403081397. The next prime is 77403081461. The reversal of 77403081409 is 90418030477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55941710400 + 21461371009 = 236520^2 + 146497^2 .

It is a cyclic number.

It is not a de Polignac number, because 77403081409 - 2¹¹ = 77403079361 is a prime.

It is not a weakly prime, because it can be changed into another prime (77403081499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38701540704 + 38701540705.

It is an arithmetic number, because the mean of its divisors is an integer number (38701540705).

Almost surely, 2^77403081409 is an apocalyptic number.

It is an amenable number.

77403081409 is a deficient number, since it is larger than the sum of its proper divisors (1).

77403081409 is an equidigital number, since it uses as much as digits as its factorization.

77403081409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 77403081409 in words is "seventy-seven billion, four hundred three million, eighty-one thousand, four hundred nine".