221671520070066 has 48 divisors (see below), whose sum is σ = 524240182241568. Its totient is φ = 67136096025600.

The previous prime is 221671520070061. The next prime is 221671520070097. The reversal of 221671520070066 is 660070025176122.

221671520070066 is a `hidden beast` number, since 2 + 2 + 1 + 67 + 1 + 520 + 0 + 7 + 0 + 0 + 66 = 666.

It is not an unprimeable number, because it can be changed into a prime (221671520070061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 308739471 + ... + 309456626.

It is an arithmetic number, because the mean of its divisors is an integer number (10921670463366).

Almost surely, 2^{221671520070066} is an apocalyptic number.

221671520070066 is an abundant number, since it is smaller than the sum of its proper divisors (302568662171502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221671520070066 is a wasteful number, since it uses less digits than its factorization.

221671520070066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618197927 (or 618197924 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 221671520070066 in words is "two hundred twenty-one trillion, six hundred seventy-one billion, five hundred twenty million, seventy thousand, sixty-six".