1655842681 has 4 divisors (see below), whose sum is σ = 1661998500. Its totient is φ = 1649686864.

The previous prime is 1655842679. The next prime is 1655842697. The reversal of 1655842681 is 1862485561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 204232681 + 1451610000 = 14291^2 + 38100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1655842681 - 2¹ = 1655842679 is a prime.

It is a super-2 number, since 2×1655842681² = 5483629968442535522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1655842081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3077506 + ... + 3078043.

It is an arithmetic number, because the mean of its divisors is an integer number (415499625).

Almost surely, 2^1655842681 is an apocalyptic number.

It is an amenable number.

1655842681 is a deficient number, since it is larger than the sum of its proper divisors (6155819).

1655842681 is an equidigital number, since it uses as much as digits as its factorization.

1655842681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6155818.

The product of its digits is 460800, while the sum is 46.

The square root of 1655842681 is about 40692.0469010838. The cubic root of 1655842681 is about 1183.0588742744.

The spelling of 1655842681 in words is "one billion, six hundred fifty-five million, eight hundred forty-two thousand, six hundred eighty-one".