66256406340 has 24 divisors (see below), whose sum is σ = 185517937920. Its totient is φ = 17668375008.

The previous prime is 66256406317. The next prime is 66256406369. The reversal of 66256406340 is 4360465266.

It is a super-2 number, since 2×66256406340² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66256406292 and 66256406301.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552136660 + ... + 552136779.

It is an arithmetic number, because the mean of its divisors is an integer number (7729914080).

Almost surely, 2^66256406340 is an apocalyptic number.

66256406340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66256406340 is an abundant number, since it is smaller than the sum of its proper divisors (119261531580).

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

66256406340 is a wasteful number, since it uses less digits than its factorization.

66256406340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104273451 (or 1104273449 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 42.

The spelling of 66256406340 in words is "sixty-six billion, two hundred fifty-six million, four hundred six thousand, three hundred forty".