66454431547 has 24 divisors (see below), whose sum is σ = 78001862400. Its totient is φ = 55457444640.

The previous prime is 66454431499. The next prime is 66454431557. The reversal of 66454431547 is 74513445466.

It is not a de Polignac number, because 66454431547 - 2⁷ = 66454431419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66454431547.

It is not an unprimeable number, because it can be changed into a prime (66454431557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2562954 + ... + 2588752.

It is an arithmetic number, because the mean of its divisors is an integer number (3250077600).

Almost surely, 2^66454431547 is an apocalyptic number.

66454431547 is a deficient number, since it is larger than the sum of its proper divisors (11547430853).

66454431547 is a wasteful number, since it uses less digits than its factorization.

66454431547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26043 (or 25990 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 49.

The spelling of 66454431547 in words is "sixty-six billion, four hundred fifty-four million, four hundred thirty-one thousand, five hundred forty-seven".