66835207238889 has 8 divisors (see below), whose sum is σ = 89113845987712. Its totient is φ = 44556686658000.

The previous prime is 66835207238867. The next prime is 66835207238893. The reversal of 66835207238889 is 98883270253866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66835207238889 - 2¹⁵ = 66835207206121 is a prime.

It is a super-2 number, since 2×66835207238889² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66835207238889.

It is not an unprimeable number, because it can be changed into a prime (66835207238809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28213729 + ... + 30490734.

It is an arithmetic number, because the mean of its divisors is an integer number (11139230748464).

Almost surely, 2^{66835207238889} is an apocalyptic number.

It is an amenable number.

66835207238889 is a deficient number, since it is larger than the sum of its proper divisors (22278638748823).

66835207238889 is a wasteful number, since it uses less digits than its factorization.

66835207238889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59083967.

The product of its (nonzero) digits is 1672151040, while the sum is 75.

The spelling of 66835207238889 in words is "sixty-six trillion, eight hundred thirty-five billion, two hundred seven million, two hundred thirty-eight thousand, eight hundred eighty-nine".