856450642415 has 4 divisors (see below), whose sum is σ = 1027740770904. Its totient is φ = 685160513928.

The previous prime is 856450642379. The next prime is 856450642441. The reversal of 856450642415 is 514246054658.

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

It is a cyclic number.

It is not a de Polignac number, because 856450642415 - 2¹⁸ = 856450380271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85645064237 + ... + 85645064246.

It is an arithmetic number, because the mean of its divisors is an integer number (256935192726).

Almost surely, 2^856450642415 is an apocalyptic number.

856450642415 is a deficient number, since it is larger than the sum of its proper divisors (171290128489).

856450642415 is a wasteful number, since it uses less digits than its factorization.

856450642415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171290128488.

The product of its (nonzero) digits is 4608000, while the sum is 50.

The spelling of 856450642415 in words is "eight hundred fifty-six billion, four hundred fifty million, six hundred forty-two thousand, four hundred fifteen".