66280155861 has 16 divisors (see below), whose sum is σ = 92274868224. Its totient is φ = 42238565424.

The previous prime is 66280155853. The next prime is 66280155881. The reversal of 66280155861 is 16855108266.

It is not a de Polignac number, because 66280155861 - 2³ = 66280155853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66280155861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66280155881) 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, 198381 + ... + 414626.

It is an arithmetic number, because the mean of its divisors is an integer number (5767179264).

Almost surely, 2^66280155861 is an apocalyptic number.

It is an amenable number.

66280155861 is a deficient number, since it is larger than the sum of its proper divisors (25994712363).

66280155861 is a wasteful number, since it uses less digits than its factorization.

66280155861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614600.

The product of its (nonzero) digits is 691200, while the sum is 48.

The spelling of 66280155861 in words is "sixty-six billion, two hundred eighty million, one hundred fifty-five thousand, eight hundred sixty-one".