506222656561 has 4 divisors (see below), whose sum is σ = 506352228592. Its totient is φ = 506093084532.

The previous prime is 506222656549. The next prime is 506222656571. The reversal of 506222656561 is 165656222605.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165656222605 = 5 ⋅33131244521.

It is a cyclic number.

It is not a de Polignac number, because 506222656561 - 2³⁷ = 368783703089 is a prime.

It is a super-2 number, since 2×506222656561² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (506222656571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64780155 + ... + 64787968.

It is an arithmetic number, because the mean of its divisors is an integer number (126588057148).

Almost surely, 2^506222656561 is an apocalyptic number.

It is an amenable number.

506222656561 is a deficient number, since it is larger than the sum of its proper divisors (129572031).

506222656561 is a wasteful number, since it uses less digits than its factorization.

506222656561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129572030.

The product of its (nonzero) digits is 1296000, while the sum is 46.

The spelling of 506222656561 in words is "five hundred six billion, two hundred twenty-two million, six hundred fifty-six thousand, five hundred sixty-one".