1610855801681 has 16 divisors (see below), whose sum is σ = 1938635289600. Its totient is φ = 1307547895248.

The previous prime is 1610855801677. The next prime is 1610855801689. The reversal of 1610855801681 is 1861085580161.

It is not a de Polignac number, because 1610855801681 - 2² = 1610855801677 is a prime.

It is a super-2 number, since 2×1610855801681² (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 (1610855801689) 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 in 15 ways as a sum of consecutive naturals, for example, 2047445 + ... + 2722818.

It is an arithmetic number, because the mean of its divisors is an integer number (121164705600).

Almost surely, 2^{1610855801681} is an apocalyptic number.

It is an amenable number.

1610855801681 is a deficient number, since it is larger than the sum of its proper divisors (327779487919).

1610855801681 is a wasteful number, since it uses less digits than its factorization.

1610855801681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4772828.

The product of its (nonzero) digits is 460800, while the sum is 50.

The spelling of 1610855801681 in words is "one trillion, six hundred ten billion, eight hundred fifty-five million, eight hundred one thousand, six hundred eighty-one".