65881618810 has 64 divisors (see below), whose sum is σ = 143153455104. Its totient is φ = 21350952000.

The previous prime is 65881618771. The next prime is 65881618867. The reversal of 65881618810 is 1881618856.

It is a happy number.

It is a super-2 number, since 2×65881618810² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 259716 + ... + 446335.

It is an arithmetic number, because the mean of its divisors is an integer number (2236772736).

Almost surely, 2^65881618810 is an apocalyptic number.

65881618810 is an abundant number, since it is smaller than the sum of its proper divisors (77271836294).

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

65881618810 is a wasteful number, since it uses less digits than its factorization.

65881618810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706139.

The product of its (nonzero) digits is 737280, while the sum is 52.

The spelling of 65881618810 in words is "sixty-five billion, eight hundred eighty-one million, six hundred eighteen thousand, eight hundred ten".