855371661 has 8 divisors (see below), whose sum is σ = 1171319904. Its totient is φ = 554835600.

The previous prime is 855371603. The next prime is 855371681. The reversal of 855371661 is 166173558.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 855371661 - 2²¹ = 853274509 is a prime.

It is a super-3 number, since 3×855371661³ (a number of 28 digits) contains 333 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 (855371681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3852915 + ... + 3853136.

It is an arithmetic number, because the mean of its divisors is an integer number (146414988).

Almost surely, 2^855371661 is an apocalyptic number.

It is an amenable number.

855371661 is a deficient number, since it is larger than the sum of its proper divisors (315948243).

855371661 is a wasteful number, since it uses less digits than its factorization.

855371661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7706091.

The product of its digits is 151200, while the sum is 42.

The square root of 855371661 is about 29246.7376129373. The cubic root of 855371661 is about 949.2595008828.

The spelling of 855371661 in words is "eight hundred fifty-five million, three hundred seventy-one thousand, six hundred sixty-one".