221666601246355 has 8 divisors (see below), whose sum is σ = 266003849085552. Its totient is φ = 177330662603808.

The previous prime is 221666601246347. The next prime is 221666601246359. The reversal of 221666601246355 is 553642106666122.

221666601246355 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221666601246355 - 2³ = 221666601246347 is a prime.

It is a super-2 number, since 2×221666601246355² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221666601246296 and 221666601246305.

It is not an unprimeable number, because it can be changed into a prime (221666601246359) 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, 326926629 + ... + 327603958.

It is an arithmetic number, because the mean of its divisors is an integer number (33250481135694).

Almost surely, 2^{221666601246355} is an apocalyptic number.

221666601246355 is a deficient number, since it is larger than the sum of its proper divisors (44337247839197).

221666601246355 is an equidigital number, since it uses as much as digits as its factorization.

221666601246355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654598325.

The product of its (nonzero) digits is 18662400, while the sum is 55.

The spelling of 221666601246355 in words is "two hundred twenty-one trillion, six hundred sixty-six billion, six hundred one million, two hundred forty-six thousand, three hundred fifty-five".