221660106564 has 48 divisors (see below), whose sum is σ = 558509896448. Its totient is φ = 68017252608.

The previous prime is 221660106541. The next prime is 221660106587. The reversal of 221660106564 is 465601066122.

It is an interprime number because it is at equal distance from previous prime (221660106541) and next prime (221660106587).

It is a super-3 number, since 3×221660106564³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1878577 + ... + 1993080.

Almost surely, 2^221660106564 is an apocalyptic number.

It is an amenable number.

221660106564 is an abundant number, since it is smaller than the sum of its proper divisors (336849789884).

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

221660106564 is a wasteful number, since it uses less digits than its factorization.

221660106564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3872044 (or 3872042 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 221660106564 in words is "two hundred twenty-one billion, six hundred sixty million, one hundred six thousand, five hundred sixty-four".