20549660566 has 8 divisors (see below), whose sum is σ = 30825328464. Its totient is φ = 10274551080.

The previous prime is 20549660557. The next prime is 20549660597. The reversal of 20549660566 is 66506694502.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30570 + ... + 205021.

It is an arithmetic number, because the mean of its divisors is an integer number (3853166058).

Almost surely, 2^20549660566 is an apocalyptic number.

20549660566 is a deficient number, since it is larger than the sum of its proper divisors (10275667898).

20549660566 is a wasteful number, since it uses less digits than its factorization.

20549660566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279206.

The product of its (nonzero) digits is 2332800, while the sum is 49.

The spelling of 20549660566 in words is "twenty billion, five hundred forty-nine million, six hundred sixty thousand, five hundred sixty-six".