1856329101649 has 8 divisors (see below), whose sum is σ = 2025176395392. Its totient is φ = 1687496825040.

The previous prime is 1856329101623. The next prime is 1856329101659. The reversal of 1856329101649 is 9461019236581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1856329101649 - 2¹³ = 1856329093457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1856329101649.

It is not an unprimeable number, because it can be changed into a prime (1856329101659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3495034 + ... + 3990979.

It is an arithmetic number, because the mean of its divisors is an integer number (253147049424).

Almost surely, 2^{1856329101649} is an apocalyptic number.

It is an amenable number.

1856329101649 is a deficient number, since it is larger than the sum of its proper divisors (168847293743).

1856329101649 is a wasteful number, since it uses less digits than its factorization.

1856329101649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7508567.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The spelling of 1856329101649 in words is "one trillion, eight hundred fifty-six billion, three hundred twenty-nine million, one hundred one thousand, six hundred forty-nine".