66447994053 has 8 divisors (see below), whose sum is σ = 101254086208. Its totient is φ = 37970282304.

The previous prime is 66447993961. The next prime is 66447994069. The reversal of 66447994053 is 35049974466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-66447994053 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66447993984 and 66447994002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66447994153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1582095076 + ... + 1582095117.

It is an arithmetic number, because the mean of its divisors is an integer number (12656760776).

Almost surely, 2^66447994053 is an apocalyptic number.

It is an amenable number.

66447994053 is a deficient number, since it is larger than the sum of its proper divisors (34806092155).

66447994053 is a wasteful number, since it uses less digits than its factorization.

66447994053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3164190203.

The product of its (nonzero) digits is 19595520, while the sum is 57.

The spelling of 66447994053 in words is "sixty-six billion, four hundred forty-seven million, nine hundred ninety-four thousand, fifty-three".