505868868578 has 4 divisors (see below), whose sum is σ = 758803302870. Its totient is φ = 252934434288.

The previous prime is 505868868577. The next prime is 505868868601. The reversal of 505868868578 is 875868868505.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 484718111089 + 21150757489 = 696217^2 + 145433^2 .

It is not an unprimeable number, because it can be changed into a prime (505868868577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126467217143 + ... + 126467217146.

Almost surely, 2^505868868578 is an apocalyptic number.

505868868578 is a deficient number, since it is larger than the sum of its proper divisors (252934434292).

505868868578 is a wasteful number, since it uses less digits than its factorization.

505868868578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252934434291.

The product of its (nonzero) digits is 1032192000, while the sum is 74.

The spelling of 505868868578 in words is "five hundred five billion, eight hundred sixty-eight million, eight hundred sixty-eight thousand, five hundred seventy-eight".