66544467192 has 448 divisors, whose sum is σ = 225209064960. Its totient is φ = 18013881600.

The previous prime is 66544467173. The next prime is 66544467193. The reversal of 66544467192 is 29176444566.

66544467192 is a `hidden beast` number, since 6 + 6 + 5 + 4 + 446 + 7 + 192 = 666.

It is a super-2 number, since 2×66544467192² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66544467193) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 123002442 + ... + 123002982.

Almost surely, 2^66544467192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66544467192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112604532480).

66544467192 is an abundant number, since it is smaller than the sum of its proper divisors (158664597768).

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

66544467192 is a wasteful number, since it uses less digits than its factorization.

66544467192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726 (or 707 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 54.

The spelling of 66544467192 in words is "sixty-six billion, five hundred forty-four million, four hundred sixty-seven thousand, one hundred ninety-two".