1856218683053 has 4 divisors (see below), whose sum is σ = 2121392780640. Its totient is φ = 1591044585468.

The previous prime is 1856218683043. The next prime is 1856218683061. The reversal of 1856218683053 is 3503868126581.

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 1856218683053 - 2²⁸ = 1855950247597 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1856218683053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1856218683043) 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, 132587048783 + ... + 132587048796.

It is an arithmetic number, because the mean of its divisors is an integer number (530348195160).

Almost surely, 2^{1856218683053} is an apocalyptic number.

It is an amenable number.

1856218683053 is a deficient number, since it is larger than the sum of its proper divisors (265174097587).

1856218683053 is an equidigital number, since it uses as much as digits as its factorization.

1856218683053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265174097586.

The product of its (nonzero) digits is 8294400, while the sum is 56.

The spelling of 1856218683053 in words is "one trillion, eight hundred fifty-six billion, two hundred eighteen million, six hundred eighty-three thousand, fifty-three".