2660701581 has 8 divisors (see below), whose sum is σ = 3941780160. Its totient is φ = 1773801036.

The previous prime is 2660701579. The next prime is 2660701619. The reversal of 2660701581 is 1851070662.

2660701581 is a `hidden beast` number, since 2 + 6 + 6 + 0 + 70 + 1 + 581 = 666.

It is not a de Polignac number, because 2660701581 - 2¹ = 2660701579 is a prime.

It is a super-2 number, since 2×2660701581² = 14158665806271799122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2660701481) 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, 49272225 + ... + 49272278.

It is an arithmetic number, because the mean of its divisors is an integer number (492722520).

Almost surely, 2^2660701581 is an apocalyptic number.

It is an amenable number.

2660701581 is a deficient number, since it is larger than the sum of its proper divisors (1281078579).

2660701581 is an equidigital number, since it uses as much as digits as its factorization.

2660701581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98544512 (or 98544506 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 2660701581 is about 51581.9889205525. The cubic root of 2660701581 is about 1385.6877869121.

The spelling of 2660701581 in words is "two billion, six hundred sixty million, seven hundred one thousand, five hundred eighty-one".