20155000511 has 2 divisors, whose sum is σ = 20155000512. Its totient is φ = 20155000510.

The previous prime is 20155000507. The next prime is 20155000543. The reversal of 20155000511 is 11500055102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20155000511 - 2² = 20155000507 is a prime.

It is a super-2 number, since 2×20155000511² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20155006511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10077500255 + 10077500256.

It is an arithmetic number, because the mean of its divisors is an integer number (10077500256).

Almost surely, 2^20155000511 is an apocalyptic number.

20155000511 is a deficient number, since it is larger than the sum of its proper divisors (1).

20155000511 is an equidigital number, since it uses as much as digits as its factorization.

20155000511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 250, while the sum is 20.

Adding to 20155000511 its reverse (11500055102), we get a palindrome (31655055613).

The spelling of 20155000511 in words is "twenty billion, one hundred fifty-five million, five hundred eleven", and thus it is an aban number.