221657153616667 has 4 divisors (see below), whose sum is σ = 226811971142680. Its totient is φ = 216502336090656.

The previous prime is 221657153616617. The next prime is 221657153616739. The reversal of 221657153616667 is 766616351756122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221657153616667 - 2¹⁹ = 221657153092379 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221657153616599 and 221657153616608.

It is not an unprimeable number, because it can be changed into a prime (221657153616617) 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, 2577408762942 + ... + 2577408763027.

It is an arithmetic number, because the mean of its divisors is an integer number (56702992785670).

Almost surely, 2^{221657153616667} is an apocalyptic number.

221657153616667 is a deficient number, since it is larger than the sum of its proper divisors (5154817526013).

221657153616667 is an equidigital number, since it uses as much as digits as its factorization.

221657153616667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5154817526012.

The product of its digits is 114307200, while the sum is 64.

The spelling of 221657153616667 in words is "two hundred twenty-one trillion, six hundred fifty-seven billion, one hundred fifty-three million, six hundred sixteen thousand, six hundred sixty-seven".