221661015654060 has 144 divisors (see below), whose sum is σ = 705909630875904. Its totient is φ = 56192752370304.

The previous prime is 221661015654047. The next prime is 221661015654079. The reversal of 221661015654060 is 60456510166122.

221661015654060 is a `hidden beast` number, since 2 + 2 + 16 + 6 + 10 + 1 + 565 + 4 + 0 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 221661015653997 and 221661015654015.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 163562322 + ... + 164911961.

It is an arithmetic number, because the mean of its divisors is an integer number (4902150214416).

Almost surely, 2^{221661015654060} is an apocalyptic number.

221661015654060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221661015654060 is an abundant number, since it is smaller than the sum of its proper divisors (484248615221844).

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

221661015654060 is a wasteful number, since it uses less digits than its factorization.

221661015654060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328474484 (or 328474479 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 221661015654060 in words is "two hundred twenty-one trillion, six hundred sixty-one billion, fifteen million, six hundred fifty-four thousand, sixty".