20573816666599 has 32 divisors (see below), whose sum is σ = 25360121134080. Its totient is φ = 16310238278400.

The previous prime is 20573816666593. The next prime is 20573816666621. The reversal of 20573816666599 is 99566661837502.

It is a cyclic number.

It is not a de Polignac number, because 20573816666599 - 2¹³ = 20573816658407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20573816666593) 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, 17173782 + ... + 18332659.

It is an arithmetic number, because the mean of its divisors is an integer number (792503785440).

Almost surely, 2^{20573816666599} is an apocalyptic number.

20573816666599 is a deficient number, since it is larger than the sum of its proper divisors (4786304467481).

20573816666599 is a wasteful number, since it uses less digits than its factorization.

20573816666599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35506591.

The product of its (nonzero) digits is 881798400, while the sum is 73.

The spelling of 20573816666599 in words is "twenty trillion, five hundred seventy-three billion, eight hundred sixteen million, six hundred sixty-six thousand, five hundred ninety-nine".