1850685436649 has 4 divisors (see below), whose sum is σ = 2115069070464. Its totient is φ = 1586301802836.

The previous prime is 1850685436637. The next prime is 1850685436709. The reversal of 1850685436649 is 9466345860581.

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 1850685436649 - 2¹⁶ = 1850685371113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1850685436849) 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, 132191816897 + ... + 132191816910.

It is an arithmetic number, because the mean of its divisors is an integer number (528767267616).

Almost surely, 2^{1850685436649} is an apocalyptic number.

It is an amenable number.

1850685436649 is a deficient number, since it is larger than the sum of its proper divisors (264383633815).

1850685436649 is an equidigital number, since it uses as much as digits as its factorization.

1850685436649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264383633814.

The product of its (nonzero) digits is 149299200, while the sum is 65.

The spelling of 1850685436649 in words is "one trillion, eight hundred fifty billion, six hundred eighty-five million, four hundred thirty-six thousand, six hundred forty-nine".