1864237851853 has 16 divisors (see below), whose sum is σ = 2199038572080. Its totient is φ = 1563760751616.

The previous prime is 1864237851851. The next prime is 1864237851877. The reversal of 1864237851853 is 3581587324681.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 107412196644 + 1756825655209 = 327738^2 + 1325453^2 .

It is a cyclic number.

It is not a de Polignac number, because 1864237851853 - 2¹ = 1864237851851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1864237851791 and 1864237851800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1864237851851) 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 15 ways as a sum of consecutive naturals, for example, 145432650 + ... + 145445467.

It is an arithmetic number, because the mean of its divisors is an integer number (137439910755).

Almost surely, 2^{1864237851853} is an apocalyptic number.

1864237851853 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1864237851853 is a deficient number, since it is larger than the sum of its proper divisors (334800720227).

1864237851853 is a wasteful number, since it uses less digits than its factorization.

1864237851853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290878176.

The product of its digits is 38707200, while the sum is 61.

The spelling of 1864237851853 in words is "one trillion, eight hundred sixty-four billion, two hundred thirty-seven million, eight hundred fifty-one thousand, eight hundred fifty-three".