1855166201401 has 4 divisors (see below), whose sum is σ = 1886609696400. Its totient is φ = 1823722706404.

The previous prime is 1855166201323. The next prime is 1855166201417. The reversal of 1855166201401 is 1041026615581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1855166201401 - 2⁹ = 1855166200889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1855166201431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15721747411 + ... + 15721747528.

It is an arithmetic number, because the mean of its divisors is an integer number (471652424100).

Almost surely, 2^{1855166201401} is an apocalyptic number.

It is an amenable number.

1855166201401 is a deficient number, since it is larger than the sum of its proper divisors (31443494999).

1855166201401 is an equidigital number, since it uses as much as digits as its factorization.

1855166201401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31443494998.

The product of its (nonzero) digits is 57600, while the sum is 40.

The spelling of 1855166201401 in words is "one trillion, eight hundred fifty-five billion, one hundred sixty-six million, two hundred one thousand, four hundred one".