1855262778353 has 18 divisors (see below), whose sum is σ = 2073345926706. Its totient is φ = 1654132970304.

The previous prime is 1855262778349. The next prime is 1855262778359. The reversal of 1855262778353 is 3538772625581.

It can be written as a sum of positive squares in only one way, i.e., 1746129673744 + 109133104609 = 1321412^2 + 330353^2 .

It is not a de Polignac number, because 1855262778353 - 2² = 1855262778349 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1855262778359) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 106695326 + ... + 106712712.

It is an arithmetic number, because the mean of its divisors is an integer number (115185884817).

Almost surely, 2^{1855262778353} is an apocalyptic number.

It is an amenable number.

1855262778353 is a deficient number, since it is larger than the sum of its proper divisors (218083148353).

1855262778353 is an frugal number, since it uses more digits than its factorization.

1855262778353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34829 (or 17423 counting only the distinct ones).

The product of its digits is 84672000, while the sum is 62.

The spelling of 1855262778353 in words is "one trillion, eight hundred fifty-five billion, two hundred sixty-two million, seven hundred seventy-eight thousand, three hundred fifty-three".