39946864899518 has 4 divisors (see below), whose sum is σ = 59920297349280. Its totient is φ = 19973432449758.

The previous prime is 39946864899493. The next prime is 39946864899523. The reversal of 39946864899518 is 81599846864993.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9986716224878 + ... + 9986716224881.

It is an arithmetic number, because the mean of its divisors is an integer number (14980074337320).

Almost surely, 2^{39946864899518} is an apocalyptic number.

39946864899518 is a deficient number, since it is larger than the sum of its proper divisors (19973432449762).

39946864899518 is a wasteful number, since it uses less digits than its factorization.

39946864899518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19973432449761.

The product of its digits is 29023764480, while the sum is 89.

The spelling of 39946864899518 in words is "thirty-nine trillion, nine hundred forty-six billion, eight hundred sixty-four million, eight hundred ninety-nine thousand, five hundred eighteen".