66821467340 has 24 divisors (see below), whose sum is σ = 140391643392. Its totient is φ = 26715908480.

The previous prime is 66821467303. The next prime is 66821467343. The reversal of 66821467340 is 4376412866.

It is not an unprimeable number, because it can be changed into a prime (66821467343) 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, 749129 + ... + 833568.

It is an arithmetic number, because the mean of its divisors is an integer number (5849651808).

Almost surely, 2^66821467340 is an apocalyptic number.

It is an amenable number.

66821467340 is an abundant number, since it is smaller than the sum of its proper divisors (73570176052).

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

66821467340 is a wasteful number, since it uses less digits than its factorization.

66821467340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584817 (or 1584815 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 47.

The spelling of 66821467340 in words is "sixty-six billion, eight hundred twenty-one million, four hundred sixty-seven thousand, three hundred forty".