20005541551 has 2 divisors, whose sum is σ = 20005541552. Its totient is φ = 20005541550.

The previous prime is 20005541513. The next prime is 20005541593. The reversal of 20005541551 is 15514550002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20005541551 - 2²¹ = 20003444399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20005541851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002770775 + 10002770776.

It is an arithmetic number, because the mean of its divisors is an integer number (10002770776).

Almost surely, 2^20005541551 is an apocalyptic number.

20005541551 is a deficient number, since it is larger than the sum of its proper divisors (1).

20005541551 is an equidigital number, since it uses as much as digits as its factorization.

20005541551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5000, while the sum is 28.

The spelling of 20005541551 in words is "twenty billion, five million, five hundred forty-one thousand, five hundred fifty-one".