20664307511 has 2 divisors, whose sum is σ = 20664307512. Its totient is φ = 20664307510.

The previous prime is 20664307493. The next prime is 20664307529. The reversal of 20664307511 is 11570346602.

It is a balanced prime because it is at equal distance from previous prime (20664307493) and next prime (20664307529).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20664307511 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20664300511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10332153755 + 10332153756.

It is an arithmetic number, because the mean of its divisors is an integer number (10332153756).

Almost surely, 2^20664307511 is an apocalyptic number.

20664307511 is a deficient number, since it is larger than the sum of its proper divisors (1).

20664307511 is an equidigital number, since it uses as much as digits as its factorization.

20664307511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 20664307511 in words is "twenty billion, six hundred sixty-four million, three hundred seven thousand, five hundred eleven".