1855554642061 has 24 divisors (see below), whose sum is σ = 1899219032640. Its totient is φ = 1812850108416.

The previous prime is 1855554642059. The next prime is 1855554642079. The reversal of 1855554642061 is 1602464555581.

It is not a de Polignac number, because 1855554642061 - 2¹ = 1855554642059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1855554646061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 435676350 + ... + 435680608.

It is an arithmetic number, because the mean of its divisors is an integer number (79134126360).

Almost surely, 2^{1855554642061} is an apocalyptic number.

It is an amenable number.

1855554642061 is a deficient number, since it is larger than the sum of its proper divisors (43664390579).

1855554642061 is an equidigital number, since it uses as much as digits as its factorization.

1855554642061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5121 (or 5062 counting only the distinct ones).

The product of its (nonzero) digits is 5760000, while the sum is 52.

The spelling of 1855554642061 in words is "one trillion, eight hundred fifty-five billion, five hundred fifty-four million, six hundred forty-two thousand, sixty-one".