66973347920 has 40 divisors (see below), whose sum is σ = 155855962080. Its totient is φ = 26764749440.

The previous prime is 66973347911. The next prime is 66973347923. The reversal of 66973347920 is 2974337966.

66973347920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×66973347920² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66973347923) 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, 296390 + ... + 470949.

It is an arithmetic number, because the mean of its divisors is an integer number (3896399052).

Almost surely, 2^66973347920 is an apocalyptic number.

It is an amenable number.

66973347920 is an abundant number, since it is smaller than the sum of its proper divisors (88882614160).

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

66973347920 is a wasteful number, since it uses less digits than its factorization.

66973347920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768443 (or 768437 counting only the distinct ones).

The product of its (nonzero) digits is 10287648, while the sum is 56.

The spelling of 66973347920 in words is "sixty-six billion, nine hundred seventy-three million, three hundred forty-seven thousand, nine hundred twenty".