20665463611 has 16 divisors (see below), whose sum is σ = 22824820480. Its totient is φ = 18589525920.

The previous prime is 20665463603. The next prime is 20665463747. The reversal of 20665463611 is 11636456602.

It is a cyclic number.

It is not a de Polignac number, because 20665463611 - 2³ = 20665463603 is a prime.

It is a super-2 number, since 2×20665463611² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20665463111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203296 + ... + 287506.

It is an arithmetic number, because the mean of its divisors is an integer number (1426551280).

Almost surely, 2^20665463611 is an apocalyptic number.

20665463611 is a deficient number, since it is larger than the sum of its proper divisors (2159356869).

20665463611 is a wasteful number, since it uses less digits than its factorization.

20665463611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84706.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 20665463611 in words is "twenty billion, six hundred sixty-five million, four hundred sixty-three thousand, six hundred eleven".