39987066851 has 4 divisors (see below), whose sum is σ = 42339247272. Its totient is φ = 37634886432.

The previous prime is 39987066809. The next prime is 39987066857. The reversal of 39987066851 is 15866078993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15866078993 = 53 ⋅299359981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39987066851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39987066857) 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, 1176090185 + ... + 1176090218.

It is an arithmetic number, because the mean of its divisors is an integer number (10584811818).

Almost surely, 2^39987066851 is an apocalyptic number.

39987066851 is a deficient number, since it is larger than the sum of its proper divisors (2352180421).

39987066851 is a wasteful number, since it uses less digits than its factorization.

39987066851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2352180420.

The product of its (nonzero) digits is 19595520, while the sum is 62.

The spelling of 39987066851 in words is "thirty-nine billion, nine hundred eighty-seven million, sixty-six thousand, eight hundred fifty-one".