5515103999981 has 2 divisors, whose sum is σ = 5515103999982. Its totient is φ = 5515103999980.

The previous prime is 5515103999953. The next prime is 5515104000023. The reversal of 5515103999981 is 1899993015155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4103501004100 + 1411602995881 = 2025710^2 + 1188109^2 .

It is a cyclic number.

It is not a de Polignac number, because 5515103999981 - 2¹⁸ = 5515103737837 is a prime.

It is a super-2 number, since 2×5515103999981² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5515103909981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2757551999990 + 2757551999991.

It is an arithmetic number, because the mean of its divisors is an integer number (2757551999991).

Almost surely, 2^{5515103999981} is an apocalyptic number.

It is an amenable number.

5515103999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5515103999981 is an equidigital number, since it uses as much as digits as its factorization.

5515103999981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19683000, while the sum is 65.

The spelling of 5515103999981 in words is "five trillion, five hundred fifteen billion, one hundred three million, nine hundred ninety-nine thousand, nine hundred eighty-one".