66427817016 has 128 divisors (see below), whose sum is σ = 192535004160. Its totient is φ = 18875289600.

The previous prime is 66427816993. The next prime is 66427817083. The reversal of 66427817016 is 61071872466.

66427817016 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66427817016² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1188940 + ... + 1243556.

It is an arithmetic number, because the mean of its divisors is an integer number (1504179720).

Almost surely, 2^66427817016 is an apocalyptic number.

66427817016 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 66427817016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96267502080).

66427817016 is an abundant number, since it is smaller than the sum of its proper divisors (126107187144).

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

66427817016 is a wasteful number, since it uses less digits than its factorization.

66427817016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54925 (or 54921 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 48.

The spelling of 66427817016 in words is "sixty-six billion, four hundred twenty-seven million, eight hundred seventeen thousand, sixteen".