49871386665 has 64 divisors (see below), whose sum is σ = 89544026880. Its totient is φ = 26333475840.

The previous prime is 49871386633. The next prime is 49871386667. The reversal of 49871386665 is 56668317894.

It is not a de Polignac number, because 49871386665 - 2⁵ = 49871386633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (49871386667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25825750 + ... + 25827680.

It is an arithmetic number, because the mean of its divisors is an integer number (1399125420).

Almost surely, 2^49871386665 is an apocalyptic number.

49871386665 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

49871386665 is a deficient number, since it is larger than the sum of its proper divisors (39672640215).

49871386665 is a wasteful number, since it uses less digits than its factorization.

49871386665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3751 (or 3745 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 63.

The spelling of 49871386665 in words is "forty-nine billion, eight hundred seventy-one million, three hundred eighty-six thousand, six hundred sixty-five".