20618148847 has 2 divisors, whose sum is σ = 20618148848. Its totient is φ = 20618148846.

The previous prime is 20618148827. The next prime is 20618148871. The reversal of 20618148847 is 74884181602.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20618148847 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20618148847.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20618148827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10309074423 + 10309074424.

It is an arithmetic number, because the mean of its divisors is an integer number (10309074424).

Almost surely, 2^20618148847 is an apocalyptic number.

20618148847 is a deficient number, since it is larger than the sum of its proper divisors (1).

20618148847 is an equidigital number, since it uses as much as digits as its factorization.

20618148847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 688128, while the sum is 49.

The spelling of 20618148847 in words is "twenty billion, six hundred eighteen million, one hundred forty-eight thousand, eight hundred forty-seven".