8356861404649 has 4 divisors (see below), whose sum is σ = 8796696215440. Its totient is φ = 7917026593860.

The previous prime is 8356861404607. The next prime is 8356861404673. The reversal of 8356861404649 is 9464041686538.

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 8356861404649 - 2²¹ = 8356859307497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8356861404049) 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, 219917405367 + ... + 219917405404.

It is an arithmetic number, because the mean of its divisors is an integer number (2199174053860).

Almost surely, 2^{8356861404649} is an apocalyptic number.

It is an amenable number.

8356861404649 is a deficient number, since it is larger than the sum of its proper divisors (439834810791).

8356861404649 is a wasteful number, since it uses less digits than its factorization.

8356861404649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439834810790.

The product of its (nonzero) digits is 119439360, while the sum is 64.

The spelling of 8356861404649 in words is "eight trillion, three hundred fifty-six billion, eight hundred sixty-one million, four hundred four thousand, six hundred forty-nine".