1660212461881 has 8 divisors (see below), whose sum is σ = 1684383721344. Its totient is φ = 1636063091040.

The previous prime is 1660212461863. The next prime is 1660212461899. The reversal of 1660212461881 is 1881642120661.

It is an interprime number because it is at equal distance from previous prime (1660212461863) and next prime (1660212461899).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1660212461881 - 2¹¹ = 1660212459833 is a prime.

It is a super-2 number, since 2×1660212461881² (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 (1660212461851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5319325 + ... + 5622778.

It is an arithmetic number, because the mean of its divisors is an integer number (210547965168).

Almost surely, 2^{1660212461881} is an apocalyptic number.

It is an amenable number.

1660212461881 is a deficient number, since it is larger than the sum of its proper divisors (24171259463).

1660212461881 is a wasteful number, since it uses less digits than its factorization.

1660212461881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10944311.

The product of its (nonzero) digits is 221184, while the sum is 46.

The spelling of 1660212461881 in words is "one trillion, six hundred sixty billion, two hundred twelve million, four hundred sixty-one thousand, eight hundred eighty-one".