1916662403897 has 2 divisors, whose sum is σ = 1916662403898. Its totient is φ = 1916662403896.

The previous prime is 1916662403891. The next prime is 1916662404029. The reversal of 1916662403897 is 7983042666191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1866663655081 + 49998748816 = 1366259^2 + 223604^2 .

It is a cyclic number.

It is not a de Polignac number, because 1916662403897 - 2⁴ = 1916662403881 is a prime.

It is not a weakly prime, because it can be changed into another prime (1916662403891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 958331201948 + 958331201949.

It is an arithmetic number, because the mean of its divisors is an integer number (958331201949).

Almost surely, 2^{1916662403897} is an apocalyptic number.

It is an amenable number.

1916662403897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1916662403897 is an equidigital number, since it uses as much as digits as its factorization.

1916662403897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23514624, while the sum is 62.

The spelling of 1916662403897 in words is "one trillion, nine hundred sixteen billion, six hundred sixty-two million, four hundred three thousand, eight hundred ninety-seven".