66740175900 has 432 divisors, whose sum is σ = 230033276928. Its totient is φ = 16111872000.

The previous prime is 66740175893. The next prime is 66740175911. The reversal of 66740175900 is 957104766.

It is a happy number.

66740175900 is a `hidden beast` number, since 6 + 6 + 7 + 40 + 17 + 590 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 105768585 + ... + 105769215.

Almost surely, 2^66740175900 is an apocalyptic number.

66740175900 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 66740175900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115016638464).

66740175900 is an abundant number, since it is smaller than the sum of its proper divisors (163293101028).

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

66740175900 is a wasteful number, since it uses less digits than its factorization.

66740175900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922 (or 912 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The spelling of 66740175900 in words is "sixty-six billion, seven hundred forty million, one hundred seventy-five thousand, nine hundred".