1853851978514 has 4 divisors (see below), whose sum is σ = 2780777967774. Its totient is φ = 926925989256.

The previous prime is 1853851978513. The next prime is 1853851978541. The reversal of 1853851978514 is 4158791583581.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1518605188489 + 335246790025 = 1232317^2 + 579005^2 .

It is not an unprimeable number, because it can be changed into a prime (1853851978513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 463462994627 + ... + 463462994630.

Almost surely, 2^{1853851978514} is an apocalyptic number.

1853851978514 is a deficient number, since it is larger than the sum of its proper divisors (926925989260).

1853851978514 is an equidigital number, since it uses as much as digits as its factorization.

1853851978514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926925989259.

The product of its digits is 48384000, while the sum is 65.

The spelling of 1853851978514 in words is "one trillion, eight hundred fifty-three billion, eight hundred fifty-one million, nine hundred seventy-eight thousand, five hundred fourteen".