66447278040 has 768 divisors, whose sum is σ = 252915955200. Its totient is φ = 13801881600.

The previous prime is 66447277957. The next prime is 66447278057. The reversal of 66447278040 is 4087274466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 258549592 + ... + 258549848.

It is an arithmetic number, because the mean of its divisors is an integer number (329317650).

Almost surely, 2^66447278040 is an apocalyptic number.

66447278040 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 66447278040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126457977600).

66447278040 is an abundant number, since it is smaller than the sum of its proper divisors (186468677160).

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

66447278040 is a wasteful number, since it uses less digits than its factorization.

66447278040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 48.

The spelling of 66447278040 in words is "sixty-six billion, four hundred forty-seven million, two hundred seventy-eight thousand, forty".