2660290085 has 8 divisors (see below), whose sum is σ = 3200908920. Its totient is φ = 2122524864.

The previous prime is 2660290069. The next prime is 2660290091. The reversal of 2660290085 is 5800920662.

It is a Cunningham number, because it is equal to 51578²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 2660290084 = 1^2 + 51578^2 .

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 2660290085 - 2⁴ = 2660290069 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 711350 + ... + 715079.

It is an arithmetic number, because the mean of its divisors is an integer number (400113615).

Almost surely, 2^2660290085 is an apocalyptic number.

It is an amenable number.

2660290085 is a deficient number, since it is larger than the sum of its proper divisors (540618835).

2660290085 is a wasteful number, since it uses less digits than its factorization.

2660290085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426807.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 2660290085 is about 51578.0000096941. Note that the first 5 decimals coincide. The cubic root of 2660290085 is about 1385.6163478120.

The spelling of 2660290085 in words is "two billion, six hundred sixty million, two hundred ninety thousand, eighty-five".