39685577018 has 4 divisors (see below), whose sum is σ = 59528365530. Its totient is φ = 19842788508.

The previous prime is 39685576999. The next prime is 39685577059. The reversal of 39685577018 is 81077558693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81077558693 = 761 ⋅106540813.

It can be written as a sum of positive squares in only one way, i.e., 29243394049 + 10442182969 = 171007^2 + 102187^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9921394253 + ... + 9921394256.

Almost surely, 2^39685577018 is an apocalyptic number.

39685577018 is a deficient number, since it is larger than the sum of its proper divisors (19842788512).

39685577018 is a wasteful number, since it uses less digits than its factorization.

39685577018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19842788511.

The product of its (nonzero) digits is 12700800, while the sum is 59.

The spelling of 39685577018 in words is "thirty-nine billion, six hundred eighty-five million, five hundred seventy-seven thousand, eighteen".