221157756623 has 8 divisors (see below), whose sum is σ = 221497831968. Its totient is φ = 220817942784.

The previous prime is 221157756619. The next prime is 221157756643. The reversal of 221157756623 is 326657751122.

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

It is a cyclic number.

It is not a de Polignac number, because 221157756623 - 2² = 221157756619 is a prime.

It is a super-3 number, since 3×221157756623³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221157756643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1662215 + ... + 1790327.

It is an arithmetic number, because the mean of its divisors is an integer number (27687228996).

Almost surely, 2^221157756623 is an apocalyptic number.

221157756623 is a deficient number, since it is larger than the sum of its proper divisors (340075345).

221157756623 is a wasteful number, since it uses less digits than its factorization.

221157756623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130753.

The product of its digits is 1058400, while the sum is 47.

The spelling of 221157756623 in words is "two hundred twenty-one billion, one hundred fifty-seven million, seven hundred fifty-six thousand, six hundred twenty-three".