65981847 has 4 divisors (see below), whose sum is σ = 87975800. Its totient is φ = 43987896.

The previous prime is 65981831. The next prime is 65981893. The reversal of 65981847 is 74818956.

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

It is not a de Polignac number, because 65981847 - 2⁴ = 65981831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65981796 and 65981805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65981807) 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, 10996972 + ... + 10996977.

It is an arithmetic number, because the mean of its divisors is an integer number (21993950).

Almost surely, 2^65981847 is an apocalyptic number.

65981847 is a deficient number, since it is larger than the sum of its proper divisors (21993953).

65981847 is a wasteful number, since it uses less digits than its factorization.

65981847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21993952.

The product of its digits is 483840, while the sum is 48.

The square root of 65981847 is about 8122.9210878846. The cubic root of 65981847 is about 404.0869478415.

The spelling of 65981847 in words is "sixty-five million, nine hundred eighty-one thousand, eight hundred forty-seven".