1855640123006 has 8 divisors (see below), whose sum is σ = 2788284207360. Its totient is φ = 926212053888.

The previous prime is 1855640122997. The next prime is 1855640123093. The reversal of 1855640123006 is 6003210465581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1855640123006² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 804002366 + ... + 804004673.

It is an arithmetic number, because the mean of its divisors is an integer number (348535525920).

Almost surely, 2^{1855640123006} is an apocalyptic number.

1855640123006 is a deficient number, since it is larger than the sum of its proper divisors (932644084354).

1855640123006 is a wasteful number, since it uses less digits than its factorization.

1855640123006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608007618.

The product of its (nonzero) digits is 172800, while the sum is 41.

Adding to 1855640123006 its reverse (6003210465581), we get a palindrome (7858850588587).

The spelling of 1855640123006 in words is "one trillion, eight hundred fifty-five billion, six hundred forty million, one hundred twenty-three thousand, six".