39766806139481 has 2 divisors, whose sum is σ = 39766806139482. Its totient is φ = 39766806139480.

The previous prime is 39766806139477. The next prime is 39766806139493. The reversal of 39766806139481 is 18493160866793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24533358109456 + 15233448030025 = 4953116^2 + 3903005^2 .

It is a cyclic number.

It is not a de Polignac number, because 39766806139481 - 2² = 39766806139477 is a prime.

It is a super-2 number, since 2×39766806139481² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39766806139441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19883403069740 + 19883403069741.

It is an arithmetic number, because the mean of its divisors is an integer number (19883403069741).

Almost surely, 2^{39766806139481} is an apocalyptic number.

It is an amenable number.

39766806139481 is a deficient number, since it is larger than the sum of its proper divisors (1).

39766806139481 is an equidigital number, since it uses as much as digits as its factorization.

39766806139481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282175488, while the sum is 71.

The spelling of 39766806139481 in words is "thirty-nine trillion, seven hundred sixty-six billion, eight hundred six million, one hundred thirty-nine thousand, four hundred eighty-one".