20777373853 has 2 divisors, whose sum is σ = 20777373854. Its totient is φ = 20777373852.

The previous prime is 20777373847. The next prime is 20777373857. The reversal of 20777373853 is 35837377702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16236366084 + 4541007769 = 127422^2 + 67387^2 .

It is a cyclic number.

It is not a de Polignac number, because 20777373853 - 2¹⁷ = 20777242781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20777373853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20777373857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10388686926 + 10388686927.

It is an arithmetic number, because the mean of its divisors is an integer number (10388686927).

Almost surely, 2^20777373853 is an apocalyptic number.

It is an amenable number.

20777373853 is a deficient number, since it is larger than the sum of its proper divisors (1).

20777373853 is an equidigital number, since it uses as much as digits as its factorization.

20777373853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5186160, while the sum is 52.

The spelling of 20777373853 in words is "twenty billion, seven hundred seventy-seven million, three hundred seventy-three thousand, eight hundred fifty-three".