11778535481 has 2 divisors, whose sum is σ = 11778535482. Its totient is φ = 11778535480.

The previous prime is 11778535429. The next prime is 11778535501. The reversal of 11778535481 is 18453587711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6449535481 + 5329000000 = 80309^2 + 73000^2 .

It is a cyclic number.

It is not a de Polignac number, because 11778535481 - 2¹⁰ = 11778534457 is a prime.

It is a super-2 number, since 2×11778535481² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11778535421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5889267740 + 5889267741.

It is an arithmetic number, because the mean of its divisors is an integer number (5889267741).

Almost surely, 2^11778535481 is an apocalyptic number.

It is an amenable number.

11778535481 is a deficient number, since it is larger than the sum of its proper divisors (1).

11778535481 is an equidigital number, since it uses as much as digits as its factorization.

11778535481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 940800, while the sum is 50.

The spelling of 11778535481 in words is "eleven billion, seven hundred seventy-eight million, five hundred thirty-five thousand, four hundred eighty-one".