8400786191957 has 2 divisors, whose sum is σ = 8400786191958. Its totient is φ = 8400786191956.

The previous prime is 8400786191953. The next prime is 8400786192023. The reversal of 8400786191957 is 7591916870048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8392759644676 + 8026547281 = 2897026^2 + 89591^2 .

It is a cyclic number.

It is not a de Polignac number, because 8400786191957 - 2² = 8400786191953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8400786191893 and 8400786191902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8400786191953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4200393095978 + 4200393095979.

It is an arithmetic number, because the mean of its divisors is an integer number (4200393095979).

Almost surely, 2^{8400786191957} is an apocalyptic number.

It is an amenable number.

8400786191957 is a deficient number, since it is larger than the sum of its proper divisors (1).

8400786191957 is an equidigital number, since it uses as much as digits as its factorization.

8400786191957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30481920, while the sum is 65.

The spelling of 8400786191957 in words is "eight trillion, four hundred billion, seven hundred eighty-six million, one hundred ninety-one thousand, nine hundred fifty-seven".