501221255505 has 64 divisors (see below), whose sum is σ = 854615494656. Its totient is φ = 249970688000.

The previous prime is 501221255489. The next prime is 501221255533. The reversal of 501221255505 is 505552122105.

It is a happy number.

It is not a de Polignac number, because 501221255505 - 2⁴ = 501221255489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 42903265 + ... + 42914945.

It is an arithmetic number, because the mean of its divisors is an integer number (13353367104).

Almost surely, 2^501221255505 is an apocalyptic number.

It is an amenable number.

501221255505 is a deficient number, since it is larger than the sum of its proper divisors (353394239151).

501221255505 is a wasteful number, since it uses less digits than its factorization.

501221255505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12778.

The product of its (nonzero) digits is 25000, while the sum is 33.

The spelling of 501221255505 in words is "five hundred one billion, two hundred twenty-one million, two hundred fifty-five thousand, five hundred five".