1556740883693 has 2 divisors, whose sum is σ = 1556740883694. Its totient is φ = 1556740883692.

The previous prime is 1556740883651. The next prime is 1556740883701. The reversal of 1556740883693 is 3963880476551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1550866734244 + 5874149449 = 1245338^2 + 76643^2 .

It is a cyclic number.

It is not a de Polignac number, because 1556740883693 - 2¹² = 1556740879597 is a prime.

It is a super-2 number, since 2×1556740883693² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1556740883293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778370441846 + 778370441847.

It is an arithmetic number, because the mean of its divisors is an integer number (778370441847).

Almost surely, 2^{1556740883693} is an apocalyptic number.

It is an amenable number.

1556740883693 is a deficient number, since it is larger than the sum of its proper divisors (1).

1556740883693 is an equidigital number, since it uses as much as digits as its factorization.

1556740883693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 130636800, while the sum is 65.

The spelling of 1556740883693 in words is "one trillion, five hundred fifty-six billion, seven hundred forty million, eight hundred eighty-three thousand, six hundred ninety-three".