505255172890 has 16 divisors (see below), whose sum is σ = 979417720008. Its totient is φ = 186555756096.

The previous prime is 505255172887. The next prime is 505255172909. The reversal of 505255172890 is 98271552505.

It can be written as a sum of positive squares in 4 ways, for example, as 455313203361 + 49941969529 = 674769^2 + 223477^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1943288997 + ... + 1943289256.

Almost surely, 2^505255172890 is an apocalyptic number.

505255172890 is a deficient number, since it is larger than the sum of its proper divisors (474162547118).

505255172890 is a wasteful number, since it uses less digits than its factorization.

505255172890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3886578273.

The product of its (nonzero) digits is 1260000, while the sum is 49.

The spelling of 505255172890 in words is "five hundred five billion, two hundred fifty-five million, one hundred seventy-two thousand, eight hundred ninety".