66420528855 has 48 divisors (see below), whose sum is σ = 110006986752. Its totient is φ = 34220577600.

The previous prime is 66420528781. The next prime is 66420528877. The reversal of 66420528855 is 55882502466.

It is not a de Polignac number, because 66420528855 - 2¹¹ = 66420526807 is a prime.

It is a super-2 number, since 2×66420528855² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66420528798 and 66420528807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8746110 + ... + 8753700.

It is an arithmetic number, because the mean of its divisors is an integer number (2291812224).

Almost surely, 2^66420528855 is an apocalyptic number.

66420528855 is a deficient number, since it is larger than the sum of its proper divisors (43586457897).

66420528855 is a wasteful number, since it uses less digits than its factorization.

66420528855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8268 (or 8237 counting only the distinct ones).

The product of its (nonzero) digits is 4608000, while the sum is 51.

The spelling of 66420528855 in words is "sixty-six billion, four hundred twenty million, five hundred twenty-eight thousand, eight hundred fifty-five".