855937678561 has 45 divisors (see below), whose sum is σ = 1015583445681. Its totient is φ = 721343167272.

The previous prime is 855937678537. The next prime is 855937678573. The reversal of 855937678561 is 165876739558.

It is a happy number.

The square root of 855937678561 is 925169.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 855937678561 - 2⁹ = 855937678049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (855937678511) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 3581329080 + ... + 3581329318.

Almost surely, 2^855937678561 is an apocalyptic number.

855937678561 is the 925169-th square number.

855937678561 is the 462585-th centered octagonal number.

It is an amenable number.

855937678561 is a deficient number, since it is larger than the sum of its proper divisors (159645767120).

855937678561 is an frugal number, since it uses more digits than its factorization.

855937678561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 325 counting only the distinct ones).

The product of its digits is 381024000, while the sum is 70.

The spelling of 855937678561 in words is "eight hundred fifty-five billion, nine hundred thirty-seven million, six hundred seventy-eight thousand, five hundred sixty-one".