856404153529 has 4 divisors (see below), whose sum is σ = 857761371520. Its totient is φ = 855046935540.

The previous prime is 856404153461. The next prime is 856404153551. The reversal of 856404153529 is 925351404658.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 856404153529 - 2⁷ = 856404153401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856404853529) 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, 678608049 + ... + 678609310.

It is an arithmetic number, because the mean of its divisors is an integer number (214440342880).

Almost surely, 2^856404153529 is an apocalyptic number.

It is an amenable number.

856404153529 is a deficient number, since it is larger than the sum of its proper divisors (1357217991).

856404153529 is a wasteful number, since it uses less digits than its factorization.

856404153529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357217990.

The product of its (nonzero) digits is 5184000, while the sum is 52.

The spelling of 856404153529 in words is "eight hundred fifty-six billion, four hundred four million, one hundred fifty-three thousand, five hundred twenty-nine".