66469649825 has 24 divisors (see below), whose sum is σ = 86024488128. Its totient is φ = 50852767680.

The previous prime is 66469649801. The next prime is 66469649849. The reversal of 66469649825 is 52894696466.

It is an interprime number because it is at equal distance from previous prime (66469649801) and next prime (66469649849).

It is not a de Polignac number, because 66469649825 - 2²⁰ = 66468601249 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3534347 + ... + 3553103.

It is an arithmetic number, because the mean of its divisors is an integer number (3584353672).

Almost surely, 2^66469649825 is an apocalyptic number.

It is an amenable number.

66469649825 is a deficient number, since it is larger than the sum of its proper divisors (19554838303).

66469649825 is a wasteful number, since it uses less digits than its factorization.

66469649825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24953 (or 24948 counting only the distinct ones).

The product of its digits is 134369280, while the sum is 65.

The spelling of 66469649825 in words is "sixty-six billion, four hundred sixty-nine million, six hundred forty-nine thousand, eight hundred twenty-five".