20511626453009 has 12 divisors (see below), whose sum is σ = 21474071652516. Its totient is φ = 19590663493632.

The previous prime is 20511626452991. The next prime is 20511626453027. The reversal of 20511626453009 is 90035462611502.

It is an interprime number because it is at equal distance from previous prime (20511626452991) and next prime (20511626453027).

It can be written as a sum of positive squares in 2 ways, for example, as 3818518534609 + 16693107918400 = 1954103^2 + 4085720^2 .

It is not a de Polignac number, because 20511626453009 - 2¹² = 20511626448913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20511626453039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28451072 + ... + 29163105.

It is an arithmetic number, because the mean of its divisors is an integer number (1789505971043).

Almost surely, 2^{20511626453009} is an apocalyptic number.

It is an amenable number.

20511626453009 is a deficient number, since it is larger than the sum of its proper divisors (962445199507).

20511626453009 is an equidigital number, since it uses as much as digits as its factorization.

20511626453009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57614896 (or 57614873 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 20511626453009 in words is "twenty trillion, five hundred eleven billion, six hundred twenty-six million, four hundred fifty-three thousand, nine".