655171890 has 32 divisors (see below), whose sum is σ = 1573226496. Its totient is φ = 174622080.

The previous prime is 655171877. The next prime is 655171897. The reversal of 655171890 is 98171556.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (655171897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69775 + ... + 78605.

It is an arithmetic number, because the mean of its divisors is an integer number (49163328).

Almost surely, 2^655171890 is an apocalyptic number.

655171890 is an abundant number, since it is smaller than the sum of its proper divisors (918054606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

655171890 is a wasteful number, since it uses less digits than its factorization.

655171890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11314.

The product of its (nonzero) digits is 75600, while the sum is 42.

The square root of 655171890 is about 25596.3257128831. The cubic root of 655171890 is about 868.5305224081.

The spelling of 655171890 in words is "six hundred fifty-five million, one hundred seventy-one thousand, eight hundred ninety".