1262002561997 has 2 divisors, whose sum is σ = 1262002561998. Its totient is φ = 1262002561996.

The previous prime is 1262002561973. The next prime is 1262002562033. The reversal of 1262002561997 is 7991652002621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1105587057961 + 156415504036 = 1051469^2 + 395494^2 .

It is a cyclic number.

It is not a de Polignac number, because 1262002561997 - 2³² = 1257707594701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1262002561697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631001280998 + 631001280999.

It is an arithmetic number, because the mean of its divisors is an integer number (631001280999).

Almost surely, 2^{1262002561997} is an apocalyptic number.

It is an amenable number.

1262002561997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1262002561997 is an equidigital number, since it uses as much as digits as its factorization.

1262002561997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 1262002561997 in words is "one trillion, two hundred sixty-two billion, two million, five hundred sixty-one thousand, nine hundred ninety-seven".