38661780491 has 2 divisors, whose sum is σ = 38661780492. Its totient is φ = 38661780490.

The previous prime is 38661780461. The next prime is 38661780523. The reversal of 38661780491 is 19408716683.

It is a weak prime.

It is an emirp because it is prime and its reverse (19408716683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38661780491 - 2¹⁴ = 38661764107 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (38661780401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19330890245 + 19330890246.

It is an arithmetic number, because the mean of its divisors is an integer number (19330890246).

Almost surely, 2^38661780491 is an apocalyptic number.

38661780491 is a deficient number, since it is larger than the sum of its proper divisors (1).

38661780491 is an equidigital number, since it uses as much as digits as its factorization.

38661780491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The spelling of 38661780491 in words is "thirty-eight billion, six hundred sixty-one million, seven hundred eighty thousand, four hundred ninety-one".