221561453160 has 48 divisors (see below), whose sum is σ = 720074723940. Its totient is φ = 59083054080.

The previous prime is 221561453149. The next prime is 221561453167. The reversal of 221561453160 is 61354165122.

221561453160 is a `hidden beast` number, since 2 + 2 + 1 + 5 + 61 + 4 + 531 + 60 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 220672578564 + 888874596 = 469758^2 + 29814^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (221561453167) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 307723881 + ... + 307724600.

Almost surely, 2^221561453160 is an apocalyptic number.

221561453160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221561453160 is an abundant number, since it is smaller than the sum of its proper divisors (498513270780).

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

221561453160 is a wasteful number, since it uses less digits than its factorization.

221561453160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615448498 (or 615448491 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 221561453160 in words is "two hundred twenty-one billion, five hundred sixty-one million, four hundred fifty-three thousand, one hundred sixty".