1855421626406 has 4 divisors (see below), whose sum is σ = 2783132439612. Its totient is φ = 927710813202.

The previous prime is 1855421626397. The next prime is 1855421626427. The reversal of 1855421626406 is 6046261245581.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 463855406600 + ... + 463855406603.

It is an arithmetic number, because the mean of its divisors is an integer number (695783109903).

Almost surely, 2^{1855421626406} is an apocalyptic number.

1855421626406 is a deficient number, since it is larger than the sum of its proper divisors (927710813206).

1855421626406 is an equidigital number, since it uses as much as digits as its factorization.

1855421626406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927710813205.

The product of its (nonzero) digits is 2764800, while the sum is 50.

The spelling of 1855421626406 in words is "one trillion, eight hundred fifty-five billion, four hundred twenty-one million, six hundred twenty-six thousand, four hundred six".