1800403087681 has 27 divisors (see below), whose sum is σ = 1991510268993. Its totient is φ = 1626411706920.

The previous prime is 1800403087663. The next prime is 1800403087699. The reversal of 1800403087681 is 1867803040081.

The square root of 1800403087681 is 1341791.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (1800403087663) and next prime (1800403087699).

It is not a de Polignac number, because 1800403087681 - 2¹⁵ = 1800403054913 is a prime.

It is a super-2 number, since 2×1800403087681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1800403087181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3291413050 + ... + 3291413596.

Almost surely, 2^{1800403087681} is an apocalyptic number.

1800403087681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1800403087681 is the 1341791-st square number.

1800403087681 is the 670896-th centered octagonal number.

It is an amenable number.

1800403087681 is a deficient number, since it is larger than the sum of its proper divisors (191107181312).

1800403087681 is an frugal number, since it uses more digits than its factorization.

1800403087681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 1800403087681 in words is "one trillion, eight hundred billion, four hundred three million, eighty-seven thousand, six hundred eighty-one".