66865947031420 has 48 divisors (see below), whose sum is σ = 140806551029760. Its totient is φ = 26672537526336.

The previous prime is 66865947031417. The next prime is 66865947031427. The reversal of 66865947031420 is 2413074956866.

66865947031420 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 2×66865947031420² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66865947031427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11853889 + ... + 16560391.

It is an arithmetic number, because the mean of its divisors is an integer number (2933469813120).

It is a 1-persistent number, because it is pandigital, but 2⋅66865947031420 = 133731894062840 is not.

Almost surely, 2^{66865947031420} is an apocalyptic number.

It is an amenable number.

66865947031420 is an abundant number, since it is smaller than the sum of its proper divisors (73940603998340).

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

66865947031420 is a wasteful number, since it uses less digits than its factorization.

66865947031420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4708474 (or 4708472 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 61.

The spelling of 66865947031420 in words is "sixty-six trillion, eight hundred sixty-five billion, nine hundred forty-seven million, thirty-one thousand, four hundred twenty".