855451657 has 4 divisors (see below), whose sum is σ = 884950020. Its totient is φ = 825953296.

The previous prime is 855451631. The next prime is 855451661. The reversal of 855451657 is 756154558.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 756154558 = 2 ⋅378077279.

It can be written as a sum of positive squares in 2 ways, for example, as 534719376 + 320732281 = 23124^2 + 17909^2 .

It is a cyclic number.

It is not a de Polignac number, because 855451657 - 2¹⁹ = 854927369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855451607) 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, 14749138 + ... + 14749195.

It is an arithmetic number, because the mean of its divisors is an integer number (221237505).

Almost surely, 2^855451657 is an apocalyptic number.

It is an amenable number.

855451657 is a deficient number, since it is larger than the sum of its proper divisors (29498363).

855451657 is a wasteful number, since it uses less digits than its factorization.

855451657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29498362.

The product of its digits is 840000, while the sum is 46.

The square root of 855451657 is about 29248.1051864903. The cubic root of 855451657 is about 949.2890921506.

The spelling of 855451657 in words is "eight hundred fifty-five million, four hundred fifty-one thousand, six hundred fifty-seven".