20511412525511 has 2 divisors, whose sum is σ = 20511412525512. Its totient is φ = 20511412525510.

The previous prime is 20511412525489. The next prime is 20511412525529. The reversal of 20511412525511 is 11552521411502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20511412525511 - 2¹⁴ = 20511412509127 is a prime.

It is a super-2 number, since 2×20511412525511² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20511412521511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10255706262755 + 10255706262756.

It is an arithmetic number, because the mean of its divisors is an integer number (10255706262756).

Almost surely, 2^{20511412525511} is an apocalyptic number.

20511412525511 is a deficient number, since it is larger than the sum of its proper divisors (1).

20511412525511 is an equidigital number, since it uses as much as digits as its factorization.

20511412525511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20000, while the sum is 35.

The spelling of 20511412525511 in words is "twenty trillion, five hundred eleven billion, four hundred twelve million, five hundred twenty-five thousand, five hundred eleven".