221205166071652 has 24 divisors (see below), whose sum is σ = 442415539468224. Its totient is φ = 94801098175392.

The previous prime is 221205166071601. The next prime is 221205166071709. The reversal of 221205166071652 is 256170661502122.

It is a happy number.

It is a super-2 number, since 2×221205166071652² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44070418 + ... + 48832489.

It is an arithmetic number, because the mean of its divisors is an integer number (18433980811176).

Almost surely, 2^{221205166071652} is an apocalyptic number.

It is an amenable number.

221205166071652 is an abundant number, since it is smaller than the sum of its proper divisors (221210373396572).

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

221205166071652 is a wasteful number, since it uses less digits than its factorization.

221205166071652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92987955 (or 92987953 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 221205166071652 in words is "two hundred twenty-one trillion, two hundred five billion, one hundred sixty-six million, seventy-one thousand, six hundred fifty-two".