19722794406037 has 2 divisors, whose sum is σ = 19722794406038. Its totient is φ = 19722794406036.

The previous prime is 19722794405939. The next prime is 19722794406061. The reversal of 19722794406037 is 73060449722791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19140616250001 + 582178156036 = 4374999^2 + 763006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19722794406037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19722794404037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9861397203018 + 9861397203019.

It is an arithmetic number, because the mean of its divisors is an integer number (9861397203019).

Almost surely, 2^{19722794406037} is an apocalyptic number.

It is an amenable number.

19722794406037 is a deficient number, since it is larger than the sum of its proper divisors (1).

19722794406037 is an equidigital number, since it uses as much as digits as its factorization.

19722794406037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32006016, while the sum is 61.

The spelling of 19722794406037 in words is "nineteen trillion, seven hundred twenty-two billion, seven hundred ninety-four million, four hundred six thousand, thirty-seven".