1868520166687 has 2 divisors, whose sum is σ = 1868520166688. Its totient is φ = 1868520166686.

The previous prime is 1868520166663. The next prime is 1868520166741. The reversal of 1868520166687 is 7866610258681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1868520166687 - 2¹⁵ = 1868520133919 is a prime.

It is a super-2 number, since 2×1868520166687² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1868520166637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 934260083343 + 934260083344.

It is an arithmetic number, because the mean of its divisors is an integer number (934260083344).

Almost surely, 2^{1868520166687} is an apocalyptic number.

1868520166687 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868520166687 is an equidigital number, since it uses as much as digits as its factorization.

1868520166687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46448640, while the sum is 64.

The spelling of 1868520166687 in words is "one trillion, eight hundred sixty-eight billion, five hundred twenty million, one hundred sixty-six thousand, six hundred eighty-seven".