65866971 has 16 divisors (see below), whose sum is σ = 91219968. Its totient is φ = 42230400.

The previous prime is 65866949. The next prime is 65866973. The reversal of 65866971 is 17966856.

It is not a de Polignac number, because 65866971 - 2⁶ = 65866907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65866971.

It is not an unprimeable number, because it can be changed into a prime (65866973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13411 + ... + 17651.

It is an arithmetic number, because the mean of its divisors is an integer number (5701248).

Almost surely, 2^65866971 is an apocalyptic number.

65866971 is a deficient number, since it is larger than the sum of its proper divisors (25352997).

65866971 is a wasteful number, since it uses less digits than its factorization.

65866971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4442.

The product of its digits is 544320, while the sum is 48.

The square root of 65866971 is about 8115.8469058996. The cubic root of 65866971 is about 403.8523032142.

The spelling of 65866971 in words is "sixty-five million, eight hundred sixty-six thousand, nine hundred seventy-one".