64809492189 has 32 divisors (see below), whose sum is σ = 95711226240. Its totient is φ = 38749508352.

The previous prime is 64809492169. The next prime is 64809492193. The reversal of 64809492189 is 98129490846.

It is a de Polignac number, because none of the positive numbers 2^k-64809492189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64809492109) 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 31 ways as a sum of consecutive naturals, for example, 991414 + ... + 1054760.

It is an arithmetic number, because the mean of its divisors is an integer number (2990975820).

Almost surely, 2^64809492189 is an apocalyptic number.

It is an amenable number.

64809492189 is a deficient number, since it is larger than the sum of its proper divisors (30901734051).

64809492189 is a wasteful number, since it uses less digits than its factorization.

64809492189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64109.

The product of its (nonzero) digits is 8957952, while the sum is 60.

The spelling of 64809492189 in words is "sixty-four billion, eight hundred nine million, four hundred ninety-two thousand, one hundred eighty-nine".