38678116512809 has 2 divisors, whose sum is σ = 38678116512810. Its totient is φ = 38678116512808.

The previous prime is 38678116512787. The next prime is 38678116512817. The reversal of 38678116512809 is 90821561187683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34312825021225 + 4365291491584 = 5857715^2 + 2089328^2 .

It is an emirp because it is prime and its reverse (90821561187683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38678116512809 - 2¹⁶ = 38678116447273 is a prime.

It is a super-2 number, since 2×38678116512809² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (38678116512869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19339058256404 + 19339058256405.

It is an arithmetic number, because the mean of its divisors is an integer number (19339058256405).

Almost surely, 2^{38678116512809} is an apocalyptic number.

It is an amenable number.

38678116512809 is a deficient number, since it is larger than the sum of its proper divisors (1).

38678116512809 is an equidigital number, since it uses as much as digits as its factorization.

38678116512809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34836480, while the sum is 65.

The spelling of 38678116512809 in words is "thirty-eight trillion, six hundred seventy-eight billion, one hundred sixteen million, five hundred twelve thousand, eight hundred nine".