1854012840961 has 4 divisors (see below), whose sum is σ = 1860340530132. Its totient is φ = 1847685151792.

The previous prime is 1854012840929. The next prime is 1854012840997. The reversal of 1854012840961 is 1690482104581.

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

It can be written as a sum of positive squares in 2 ways, for example, as 785073969936 + 1068938871025 = 886044^2 + 1033895^2 .

It is a cyclic number.

It is not a de Polignac number, because 1854012840961 - 2⁵ = 1854012840929 is a prime.

It is a super-2 number, since 2×1854012840961² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1854012847961) 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, 3163844146 + ... + 3163844731.

It is an arithmetic number, because the mean of its divisors is an integer number (465085132533).

Almost surely, 2^{1854012840961} is an apocalyptic number.

It is an amenable number.

1854012840961 is a deficient number, since it is larger than the sum of its proper divisors (6327689171).

1854012840961 is an equidigital number, since it uses as much as digits as its factorization.

1854012840961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6327689170.

The product of its (nonzero) digits is 552960, while the sum is 49.

The spelling of 1854012840961 in words is "one trillion, eight hundred fifty-four billion, twelve million, eight hundred forty thousand, nine hundred sixty-one".