1804855215601 has 27 divisors (see below), whose sum is σ = 1869041069451. Its totient is φ = 1742851013904.

The previous prime is 1804855215599. The next prime is 1804855215623. The reversal of 1804855215601 is 1065125584081.

It is a happy number.

The square root of 1804855215601 is 1343449.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 529030749025 + 1275824466576 = 727345^2 + 1129524^2 .

It is not a de Polignac number, because 1804855215601 - 2¹ = 1804855215599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1804855215661) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9069624100 + ... + 9069624298.

It is an arithmetic number, because the mean of its divisors is an integer number (69223743313).

Almost surely, 2^{1804855215601} is an apocalyptic number.

1804855215601 is the 1343449-th square number.

1804855215601 is the 671725-th centered octagonal number.

It is an amenable number.

1804855215601 is a deficient number, since it is larger than the sum of its proper divisors (64185853850).

1804855215601 is an frugal number, since it uses more digits than its factorization.

1804855215601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 46.

The spelling of 1804855215601 in words is "one trillion, eight hundred four billion, eight hundred fifty-five million, two hundred fifteen thousand, six hundred one".