66605749080 has 384 divisors, whose sum is σ = 230290966080. Its totient is φ = 15316254720.

The previous prime is 66605749073. The next prime is 66605749099. The reversal of 66605749080 is 8094750666.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 70781410 + ... + 70782350.

Almost surely, 2^66605749080 is an apocalyptic number.

66605749080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66605749080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115145483040).

66605749080 is an abundant number, since it is smaller than the sum of its proper divisors (163685217000).

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

66605749080 is a wasteful number, since it uses less digits than its factorization.

66605749080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159 (or 1138 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 66605749080 in words is "sixty-six billion, six hundred five million, seven hundred forty-nine thousand, eighty".