65856391690 has 16 divisors (see below), whose sum is σ = 118544796000. Its totient is φ = 26341825360.

The previous prime is 65856391687. The next prime is 65856391721. The reversal of 65856391690 is 9619365856.

It is a super-2 number, since 2×65856391690² (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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426561 + ... + 560059.

It is an arithmetic number, because the mean of its divisors is an integer number (7409049750).

Almost surely, 2^65856391690 is an apocalyptic number.

65856391690 is a deficient number, since it is larger than the sum of its proper divisors (52688404310).

65856391690 is a wasteful number, since it uses less digits than its factorization.

65856391690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182837.

The product of its (nonzero) digits is 10497600, while the sum is 58.

The spelling of 65856391690 in words is "sixty-five billion, eight hundred fifty-six million, three hundred ninety-one thousand, six hundred ninety".