501500106561 has 4 divisors (see below), whose sum is σ = 668666808752. Its totient is φ = 334333404372.

The previous prime is 501500106517. The next prime is 501500106563. The reversal of 501500106561 is 165601005105.

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.

It is not a de Polignac number, because 501500106561 - 2¹¹ = 501500104513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (501500106563) 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, 83583351091 + ... + 83583351096.

It is an arithmetic number, because the mean of its divisors is an integer number (167166702188).

Almost surely, 2^501500106561 is an apocalyptic number.

It is an amenable number.

501500106561 is a deficient number, since it is larger than the sum of its proper divisors (167166702191).

501500106561 is a wasteful number, since it uses less digits than its factorization.

501500106561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167166702190.

The product of its (nonzero) digits is 4500, while the sum is 30.

The spelling of 501500106561 in words is "five hundred one billion, five hundred million, one hundred six thousand, five hundred sixty-one".