2185407152890 has 32 divisors (see below), whose sum is σ = 4236909158160. Its totient is φ = 806808812544.

The previous prime is 2185407152857. The next prime is 2185407152911. The reversal of 2185407152890 is 982517045812.

It can be written as a sum of positive squares in 8 ways, for example, as 945478135449 + 1239929017441 = 972357^2 + 1113521^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199839 + ... + 2100178.

Almost surely, 2^{2185407152890} is an apocalyptic number.

2185407152890 is a deficient number, since it is larger than the sum of its proper divisors (2051502005270).

2185407152890 is a wasteful number, since it uses less digits than its factorization.

2185407152890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2307346.

The product of its (nonzero) digits is 1612800, while the sum is 52.

The spelling of 2185407152890 in words is "two trillion, one hundred eighty-five billion, four hundred seven million, one hundred fifty-two thousand, eight hundred ninety".