1655918261 has 8 divisors (see below), whose sum is σ = 1722208224. Its totient is φ = 1590891120.

The previous prime is 1655918237. The next prime is 1655918287. The reversal of 1655918261 is 1628195561.

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 1655918261 - 2¹⁸ = 1655656117 is a prime.

It is a super-2 number, since 2×1655918261² = 5484130574226528242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655918861) 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 7 ways as a sum of consecutive naturals, for example, 313031 + ... + 318276.

It is an arithmetic number, because the mean of its divisors is an integer number (215276028).

Almost surely, 2^1655918261 is an apocalyptic number.

It is an amenable number.

1655918261 is a deficient number, since it is larger than the sum of its proper divisors (66289963).

1655918261 is an equidigital number, since it uses as much as digits as its factorization.

1655918261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631411.

The product of its digits is 129600, while the sum is 44.

The square root of 1655918261 is about 40692.9755731871. The cubic root of 1655918261 is about 1183.0768740177.

The spelling of 1655918261 in words is "one billion, six hundred fifty-five million, nine hundred eighteen thousand, two hundred sixty-one".