20511762643 has 2 divisors, whose sum is σ = 20511762644. Its totient is φ = 20511762642.

The previous prime is 20511762629. The next prime is 20511762707. The reversal of 20511762643 is 34626711502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20511762643 - 2¹³ = 20511754451 is a prime.

It is not a weakly prime, because it can be changed into another prime (20511762143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10255881321 + 10255881322.

It is an arithmetic number, because the mean of its divisors is an integer number (10255881322).

Almost surely, 2^20511762643 is an apocalyptic number.

20511762643 is a deficient number, since it is larger than the sum of its proper divisors (1).

20511762643 is an equidigital number, since it uses as much as digits as its factorization.

20511762643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 20511762643 in words is "twenty billion, five hundred eleven million, seven hundred sixty-two thousand, six hundred forty-three".