66914769636 has 144 divisors (see below), whose sum is σ = 205127290368. Its totient is φ = 18113587200.

The previous prime is 66914769631. The next prime is 66914769637. The reversal of 66914769636 is 63696741966.

It is a super-3 number, since 3×66914769636³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (66914769631) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50061 + ... + 369236.

It is an arithmetic number, because the mean of its divisors is an integer number (1424495072).

Almost surely, 2^66914769636 is an apocalyptic number.

66914769636 is a gapful number since it is divisible by the number (66) 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 66914769636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102563645184).

66914769636 is an abundant number, since it is smaller than the sum of its proper divisors (138212520732).

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

66914769636 is a wasteful number, since it uses less digits than its factorization.

66914769636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419362 (or 419357 counting only the distinct ones).

The product of its digits is 52907904, while the sum is 63.

The spelling of 66914769636 in words is "sixty-six billion, nine hundred fourteen million, seven hundred sixty-nine thousand, six hundred thirty-six".