65971667986 has 16 divisors (see below), whose sum is σ = 113184146880. Its totient is φ = 28251107280.

The previous prime is 65971667981. The next prime is 65971668011. The reversal of 65971667986 is 68976617956.

65971667986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (65971667981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1853805 + ... + 1889056.

It is an arithmetic number, because the mean of its divisors is an integer number (7074009180).

Almost surely, 2^65971667986 is an apocalyptic number.

65971667986 is a deficient number, since it is larger than the sum of its proper divisors (47212478894).

65971667986 is a wasteful number, since it uses less digits than its factorization.

65971667986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3744129.

The product of its digits is 205752960, while the sum is 70.

The spelling of 65971667986 in words is "sixty-five billion, nine hundred seventy-one million, six hundred sixty-seven thousand, nine hundred eighty-six".