221457577631 has 8 divisors (see below), whose sum is σ = 224539324800. Its totient is φ = 218377130112.

The previous prime is 221457577619. The next prime is 221457577697. The reversal of 221457577631 is 136775754122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221457577631 is a prime.

It is a super-2 number, since 2×221457577631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221457577631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221457571631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20795 + ... + 665843.

It is an arithmetic number, because the mean of its divisors is an integer number (28067415600).

Almost surely, 2^221457577631 is an apocalyptic number.

221457577631 is a deficient number, since it is larger than the sum of its proper divisors (3081747169).

221457577631 is an equidigital number, since it uses as much as digits as its factorization.

221457577631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649825.

The product of its digits is 2469600, while the sum is 50.

The spelling of 221457577631 in words is "two hundred twenty-one billion, four hundred fifty-seven million, five hundred seventy-seven thousand, six hundred thirty-one".