855081681 has 16 divisors (see below), whose sum is σ = 1205514240. Its totient is φ = 537621840.

The previous prime is 855081677. The next prime is 855081697. The reversal of 855081681 is 186180558.

It is a happy number.

It is not a de Polignac number, because 855081681 - 2² = 855081677 is a prime.

It is a super-2 number, since 2×855081681² = 1462329362363571522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (855081611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20925 + ... + 46346.

It is an arithmetic number, because the mean of its divisors is an integer number (75344640).

Almost surely, 2^855081681 is an apocalyptic number.

It is an amenable number.

855081681 is a deficient number, since it is larger than the sum of its proper divisors (350432559).

855081681 is a wasteful number, since it uses less digits than its factorization.

855081681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67516.

The product of its (nonzero) digits is 76800, while the sum is 42.

The square root of 855081681 is about 29241.7797166999. The cubic root of 855081681 is about 949.1522191032.

The spelling of 855081681 in words is "eight hundred fifty-five million, eighty-one thousand, six hundred eighty-one".