18387124876661 has 2 divisors, whose sum is σ = 18387124876662. Its totient is φ = 18387124876660.

The previous prime is 18387124876649. The next prime is 18387124876693. The reversal of 18387124876661 is 16667842178381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9876374728900 + 8510750147761 = 3142670^2 + 2917319^2 .

It is a cyclic number.

It is not a de Polignac number, because 18387124876661 - 2¹⁸ = 18387124614517 is a prime.

It is a super-2 number, since 2×18387124876661² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18387124876591 and 18387124876600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18387124876261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9193562438330 + 9193562438331.

It is an arithmetic number, because the mean of its divisors is an integer number (9193562438331).

Almost surely, 2^{18387124876661} is an apocalyptic number.

It is an amenable number.

18387124876661 is a deficient number, since it is larger than the sum of its proper divisors (1).

18387124876661 is an equidigital number, since it uses as much as digits as its factorization.

18387124876661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 130056192, while the sum is 68.

The spelling of 18387124876661 in words is "eighteen trillion, three hundred eighty-seven billion, one hundred twenty-four million, eight hundred seventy-six thousand, six hundred sixty-one".