18707862449 has 4 divisors (see below), whose sum is σ = 19808324964. Its totient is φ = 17607399936.

The previous prime is 18707862431. The next prime is 18707862473. The reversal of 18707862449 is 94426870781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94426870781 = 5821 ⋅16221761.

It can be written as a sum of positive squares in 2 ways, for example, as 9997000225 + 8710862224 = 99985^2 + 93332^2 .

It is not a de Polignac number, because 18707862449 - 2¹² = 18707858353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18707862394 and 18707862403.

It is not an unprimeable number, because it can be changed into a prime (18707862419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550231232 + ... + 550231265.

It is an arithmetic number, because the mean of its divisors is an integer number (4952081241).

Almost surely, 2^18707862449 is an apocalyptic number.

It is an amenable number.

18707862449 is a deficient number, since it is larger than the sum of its proper divisors (1100462515).

18707862449 is a wasteful number, since it uses less digits than its factorization.

18707862449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100462514.

The product of its (nonzero) digits is 5419008, while the sum is 56.

The spelling of 18707862449 in words is "eighteen billion, seven hundred seven million, eight hundred sixty-two thousand, four hundred forty-nine".