854857737661 has 4 divisors (see below), whose sum is σ = 855548812252. Its totient is φ = 854166663072.

The previous prime is 854857737631. The next prime is 854857737683. The reversal of 854857737661 is 166737758458.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 330400788025 + 524456949636 = 574805^2 + 724194^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-854857737661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (854857737631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345535440 + ... + 345537913.

It is an arithmetic number, because the mean of its divisors is an integer number (213887203063).

Almost surely, 2^854857737661 is an apocalyptic number.

It is an amenable number.

854857737661 is a deficient number, since it is larger than the sum of its proper divisors (691074591).

854857737661 is a wasteful number, since it uses less digits than its factorization.

854857737661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691074590.

The product of its digits is 237081600, while the sum is 67.

The spelling of 854857737661 in words is "eight hundred fifty-four billion, eight hundred fifty-seven million, seven hundred thirty-seven thousand, six hundred sixty-one".