39667839694081 has 3 divisors (see below), whose sum is σ = 39667845992323. Its totient is φ = 39667833395840.

The previous prime is 39667839694009. The next prime is 39667839694111. The reversal of 39667839694081 is 18049693876693.

It is a happy number.

The square root of 39667839694081 is 6298241.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3320445639681 + 36347394054400 = 1822209^2 + 6028880^2 .

It is not a de Polignac number, because 39667839694081 - 2³³ = 39659249759489 is a prime.

It is a super-2 number, since 2×39667839694081² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39667839693992 and 39667839694010.

It is not an unprimeable number, because it can be changed into a prime (39667839697081) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3149121 + ... + 9447361.

Almost surely, 2^{39667839694081} is an apocalyptic number.

39667839694081 is the 6298241-st square number.

39667839694081 is the 3149121-st centered octagonal number.

It is an amenable number.

39667839694081 is a deficient number, since it is larger than the sum of its proper divisors (6298242).

39667839694081 is an frugal number, since it uses more digits than its factorization.

39667839694081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12596482 (or 6298241 counting only the distinct ones).

The product of its (nonzero) digits is 2539579392, while the sum is 79.

The spelling of 39667839694081 in words is "thirty-nine trillion, six hundred sixty-seven billion, eight hundred thirty-nine million, six hundred ninety-four thousand, eighty-one".