66590279865 has 48 divisors (see below), whose sum is σ = 116978584320. Its totient is φ = 35036951040.

The previous prime is 66590279851. The next prime is 66590279867. The reversal of 66590279865 is 56897209566.

It is not a de Polignac number, because 66590279865 - 2⁷ = 66590279737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66590279867) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4831474 + ... + 4845236.

It is an arithmetic number, because the mean of its divisors is an integer number (2437053840).

Almost surely, 2^66590279865 is an apocalyptic number.

It is an amenable number.

66590279865 is a deficient number, since it is larger than the sum of its proper divisors (50388304455).

66590279865 is a wasteful number, since it uses less digits than its factorization.

66590279865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15214 (or 15211 counting only the distinct ones).

The product of its (nonzero) digits is 48988800, while the sum is 63.

The spelling of 66590279865 in words is "sixty-six billion, five hundred ninety million, two hundred seventy-nine thousand, eight hundred sixty-five".