66315247644 has 12 divisors (see below), whose sum is σ = 154735577864. Its totient is φ = 22105082544.

The previous prime is 66315247643. The next prime is 66315247693. The reversal of 66315247644 is 44674251366.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66315247593 and 66315247602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66315247643) 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, 2763135307 + ... + 2763135330.

Almost surely, 2^66315247644 is an apocalyptic number.

It is an amenable number.

66315247644 is an abundant number, since it is smaller than the sum of its proper divisors (88420330220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66315247644 is a wasteful number, since it uses less digits than its factorization.

66315247644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5526270644 (or 5526270642 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 48.

The spelling of 66315247644 in words is "sixty-six billion, three hundred fifteen million, two hundred forty-seven thousand, six hundred forty-four".