20123533511 has 2 divisors, whose sum is σ = 20123533512. Its totient is φ = 20123533510.

The previous prime is 20123533459. The next prime is 20123533553. The reversal of 20123533511 is 11533532102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123533511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123533411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061766755 + 10061766756.

It is an arithmetic number, because the mean of its divisors is an integer number (10061766756).

Almost surely, 2^20123533511 is an apocalyptic number.

20123533511 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123533511 is an equidigital number, since it uses as much as digits as its factorization.

20123533511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 26.

The spelling of 20123533511 in words is "twenty billion, one hundred twenty-three million, five hundred thirty-three thousand, five hundred eleven".