3540978815749 has 2 divisors, whose sum is σ = 3540978815750. Its totient is φ = 3540978815748.

The previous prime is 3540978815719. The next prime is 3540978815813. The reversal of 3540978815749 is 9475188790453.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2555704203649 + 985274612100 = 1598657^2 + 992610^2 .

It is a cyclic number.

It is not a de Polignac number, because 3540978815749 - 2²⁵ = 3540945261317 is a prime.

It is a super-3 number, since 3×3540978815749³ (a number of 39 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3540978815719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1770489407874 + 1770489407875.

It is an arithmetic number, because the mean of its divisors is an integer number (1770489407875).

Almost surely, 2^{3540978815749} is an apocalyptic number.

It is an amenable number.

3540978815749 is a deficient number, since it is larger than the sum of its proper divisors (1).

3540978815749 is an equidigital number, since it uses as much as digits as its factorization.

3540978815749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 304819200, while the sum is 70.

The spelling of 3540978815749 in words is "three trillion, five hundred forty billion, nine hundred seventy-eight million, eight hundred fifteen thousand, seven hundred forty-nine".