2154405551205 has 32 divisors (see below), whose sum is σ = 3476988313344. Its totient is φ = 1139059570176.

The previous prime is 2154405551173. The next prime is 2154405551209. The reversal of 2154405551205 is 5021555044512.

It is a happy number.

It is not a de Polignac number, because 2154405551205 - 2⁵ = 2154405551173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154405551209) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 772959 + ... + 2215011.

It is an arithmetic number, because the mean of its divisors is an integer number (108655884792).

Almost surely, 2^{2154405551205} is an apocalyptic number.

It is an amenable number.

2154405551205 is a deficient number, since it is larger than the sum of its proper divisors (1322582762139).

2154405551205 is a wasteful number, since it uses less digits than its factorization.

2154405551205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442925.

The product of its (nonzero) digits is 200000, while the sum is 39.

The spelling of 2154405551205 in words is "two trillion, one hundred fifty-four billion, four hundred five million, five hundred fifty-one thousand, two hundred five".