39946605697 has 4 divisors (see below), whose sum is σ = 39949878100. Its totient is φ = 39943333296.

The previous prime is 39946605691. The next prime is 39946605719. The reversal of 39946605697 is 79650664993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15859876096 + 24086729601 = 125936^2 + 155199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39946605697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39946605691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1617822 + ... + 1642327.

It is an arithmetic number, because the mean of its divisors is an integer number (9987469525).

Almost surely, 2^39946605697 is an apocalyptic number.

It is an amenable number.

39946605697 is a deficient number, since it is larger than the sum of its proper divisors (3272403).

39946605697 is a wasteful number, since it uses less digits than its factorization.

39946605697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3272402.

The product of its (nonzero) digits is 66134880, while the sum is 64.

The spelling of 39946605697 in words is "thirty-nine billion, nine hundred forty-six million, six hundred five thousand, six hundred ninety-seven".