1618863937841 has 2 divisors, whose sum is σ = 1618863937842. Its totient is φ = 1618863937840.

The previous prime is 1618863937811. The next prime is 1618863937879. The reversal of 1618863937841 is 1487393688161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1516028275441 + 102835662400 = 1231271^2 + 320680^2 .

It is a cyclic number.

It is not a de Polignac number, because 1618863937841 - 2¹⁴ = 1618863921457 is a prime.

It is a super-2 number, since 2×1618863937841² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1618863937811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 809431968920 + 809431968921.

It is an arithmetic number, because the mean of its divisors is an integer number (809431968921).

Almost surely, 2^{1618863937841} is an apocalyptic number.

It is an amenable number.

1618863937841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1618863937841 is an equidigital number, since it uses as much as digits as its factorization.

1618863937841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41803776, while the sum is 65.

The spelling of 1618863937841 in words is "one trillion, six hundred eighteen billion, eight hundred sixty-three million, nine hundred thirty-seven thousand, eight hundred forty-one".