66747480680 has 16 divisors (see below), whose sum is σ = 150181831620. Its totient is φ = 26698992256.

The previous prime is 66747480659. The next prime is 66747480689. The reversal of 66747480680 is 8608474766.

It can be written as a sum of positive squares in 2 ways, for example, as 56625913444 + 10121567236 = 237962^2 + 100606^2 .

It is not an unprimeable number, because it can be changed into a prime (66747480689) 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, 834343469 + ... + 834343548.

Almost surely, 2^66747480680 is an apocalyptic number.

It is an amenable number.

66747480680 is an abundant number, since it is smaller than the sum of its proper divisors (83434350940).

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

66747480680 is a wasteful number, since it uses less digits than its factorization.

66747480680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668687028 (or 1668687024 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 56.

The spelling of 66747480680 in words is "sixty-six billion, seven hundred forty-seven million, four hundred eighty thousand, six hundred eighty".