64166054561 has 32 divisors (see below), whose sum is σ = 77261361408. Its totient is φ = 52142146560.

The previous prime is 64166054531. The next prime is 64166054587. The reversal of 64166054561 is 16545066146.

It is not a de Polignac number, because 64166054561 - 2¹⁴ = 64166038177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64166054531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2417981 + ... + 2444373.

It is an arithmetic number, because the mean of its divisors is an integer number (2414417544).

Almost surely, 2^64166054561 is an apocalyptic number.

It is an amenable number.

64166054561 is a deficient number, since it is larger than the sum of its proper divisors (13095306847).

64166054561 is a wasteful number, since it uses less digits than its factorization.

64166054561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26681.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 64166054561 in words is "sixty-four billion, one hundred sixty-six million, fifty-four thousand, five hundred sixty-one".