38778395561 has 2 divisors, whose sum is σ = 38778395562. Its totient is φ = 38778395560.

The previous prime is 38778395533. The next prime is 38778395599. The reversal of 38778395561 is 16559387783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32523958336 + 6254437225 = 180344^2 + 79085^2 .

It is a cyclic number.

It is not a de Polignac number, because 38778395561 - 2¹⁴ = 38778379177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 38778395494 and 38778395503.

It is not a weakly prime, because it can be changed into another prime (38778305561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19389197780 + 19389197781.

It is an arithmetic number, because the mean of its divisors is an integer number (19389197781).

Almost surely, 2^38778395561 is an apocalyptic number.

It is an amenable number.

38778395561 is a deficient number, since it is larger than the sum of its proper divisors (1).

38778395561 is an equidigital number, since it uses as much as digits as its factorization.

38778395561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38102400, while the sum is 62.

The spelling of 38778395561 in words is "thirty-eight billion, seven hundred seventy-eight million, three hundred ninety-five thousand, five hundred sixty-one".