66546533430 has 144 divisors (see below), whose sum is σ = 191342399040. Its totient is φ = 16031987712.

The previous prime is 66546533423. The next prime is 66546533453. The reversal of 66546533430 is 3433564566.

66546533430 is a `hidden beast` number, since 66 + 54 + 6 + 533 + 4 + 3 + 0 = 666.

It is a super-2 number, since 2×66546533430² (a number of 22 digits) contains 22 as substring.

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 71 ways as a sum of consecutive naturals, for example, 668326 + ... + 761414.

It is an arithmetic number, because the mean of its divisors is an integer number (1328766660).

Almost surely, 2^66546533430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66546533430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95671199520).

66546533430 is an abundant number, since it is smaller than the sum of its proper divisors (124795865610).

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

66546533430 is a wasteful number, since it uses less digits than its factorization.

66546533430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93175 (or 93159 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 45.

The spelling of 66546533430 in words is "sixty-six billion, five hundred forty-six million, five hundred thirty-three thousand, four hundred thirty".