66793233648 has 80 divisors (see below), whose sum is σ = 182852466336. Its totient is φ = 20937154560.

The previous prime is 66793233641. The next prime is 66793233649. The reversal of 66793233648 is 84633239766.

It is a super-2 number, since 2×66793233648² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66793233641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 956068 + ... + 1023548.

Almost surely, 2^66793233648 is an apocalyptic number.

66793233648 is a gapful number since it is divisible by the number (68) 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 66793233648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91426233168).

66793233648 is an abundant number, since it is smaller than the sum of its proper divisors (116059232688).

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

66793233648 is a wasteful number, since it uses less digits than its factorization.

66793233648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68722 (or 68716 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 57.

The spelling of 66793233648 in words is "sixty-six billion, seven hundred ninety-three million, two hundred thirty-three thousand, six hundred forty-eight".