20665060551 has 32 divisors (see below), whose sum is σ = 30804995520. Its totient is φ = 13691400192.

The previous prime is 20665060501. The next prime is 20665060643. The reversal of 20665060551 is 15506056602.

It is a happy number.

It is not a de Polignac number, because 20665060551 - 2⁶ = 20665060487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20665060501) 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, 3627061 + ... + 3632753.

It is an arithmetic number, because the mean of its divisors is an integer number (962656110).

Almost surely, 2^20665060551 is an apocalyptic number.

20665060551 is a deficient number, since it is larger than the sum of its proper divisors (10139934969).

20665060551 is a wasteful number, since it uses less digits than its factorization.

20665060551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6512 (or 6506 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 20665060551 in words is "twenty billion, six hundred sixty-five million, sixty thousand, five hundred fifty-one".