66703440340 has 36 divisors (see below), whose sum is σ = 146432358324. Its totient is φ = 25521312256.

The previous prime is 66703440319. The next prime is 66703440341. The reversal of 66703440340 is 4304430766.

It can be written as a sum of positive squares in 2 ways, for example, as 19222158736 + 47481281604 = 138644^2 + 217902^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66703440340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66703440341) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3141757 + ... + 3162916.

It is an arithmetic number, because the mean of its divisors is an integer number (4067565509).

Almost surely, 2^66703440340 is an apocalyptic number.

It is an amenable number.

66703440340 is an abundant number, since it is smaller than the sum of its proper divisors (79728917984).

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

66703440340 is a wasteful number, since it uses less digits than its factorization.

66703440340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6304728 (or 6304703 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 37.

The spelling of 66703440340 in words is "sixty-six billion, seven hundred three million, four hundred forty thousand, three hundred forty".