65681782987 has 8 divisors (see below), whose sum is σ = 67368232512. Its totient is φ = 63999355200.

The previous prime is 65681782937. The next prime is 65681782997. The reversal of 65681782987 is 78928718656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65681782987 - 2¹¹ = 65681780939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65681782927) 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, 972339 + ... + 1037692.

It is an arithmetic number, because the mean of its divisors is an integer number (8421029064).

Almost surely, 2^65681782987 is an apocalyptic number.

65681782987 is a deficient number, since it is larger than the sum of its proper divisors (1686449525).

65681782987 is a wasteful number, since it uses less digits than its factorization.

65681782987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010869.

The product of its digits is 81285120, while the sum is 67.

The spelling of 65681782987 in words is "sixty-five billion, six hundred eighty-one million, seven hundred eighty-two thousand, nine hundred eighty-seven".