1518211757641 has 2 divisors, whose sum is σ = 1518211757642. Its totient is φ = 1518211757640.

The previous prime is 1518211757627. The next prime is 1518211757701. The reversal of 1518211757641 is 1467571128151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1431085838400 + 87125919241 = 1196280^2 + 295171^2 .

It is an emirp because it is prime and its reverse (1467571128151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1518211757641 - 2⁹ = 1518211757129 is a prime.

It is not a weakly prime, because it can be changed into another prime (1518211757341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 759105878820 + 759105878821.

It is an arithmetic number, because the mean of its divisors is an integer number (759105878821).

Almost surely, 2^{1518211757641} is an apocalyptic number.

It is an amenable number.

1518211757641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1518211757641 is an equidigital number, since it uses as much as digits as its factorization.

1518211757641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 470400, while the sum is 49.

The spelling of 1518211757641 in words is "one trillion, five hundred eighteen billion, two hundred eleven million, seven hundred fifty-seven thousand, six hundred forty-one".