11787779461 has 2 divisors, whose sum is σ = 11787779462. Its totient is φ = 11787779460.

The previous prime is 11787779459. The next prime is 11787779477. The reversal of 11787779461 is 16497778711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10548317025 + 1239462436 = 102705^2 + 35206^2 .

It is an emirp because it is prime and its reverse (16497778711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11787779461 - 2¹ = 11787779459 is a prime.

Together with 11787779459, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 11787779396 and 11787779405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11787779431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5893889730 + 5893889731.

It is an arithmetic number, because the mean of its divisors is an integer number (5893889731).

Almost surely, 2^11787779461 is an apocalyptic number.

It is an amenable number.

11787779461 is a deficient number, since it is larger than the sum of its proper divisors (1).

11787779461 is an equidigital number, since it uses as much as digits as its factorization.

11787779461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4148928, while the sum is 58.

The spelling of 11787779461 in words is "eleven billion, seven hundred eighty-seven million, seven hundred seventy-nine thousand, four hundred sixty-one".