221545351501740 has 72 divisors (see below), whose sum is σ = 768023885210400. Its totient is φ = 50638937485824.

The previous prime is 221545351501697. The next prime is 221545351501777. The reversal of 221545351501740 is 47105153545122.

221545351501740 is a `hidden beast` number, since 2 + 2 + 1 + 5 + 4 + 53 + 51 + 501 + 7 + 40 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87914820765 + ... + 87914823284.

It is an arithmetic number, because the mean of its divisors is an integer number (10666998405700).

Almost surely, 2^{221545351501740} is an apocalyptic number.

221545351501740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221545351501740 is an abundant number, since it is smaller than the sum of its proper divisors (546478533708660).

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

221545351501740 is a wasteful number, since it uses less digits than its factorization.

221545351501740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175829644071 (or 175829644066 counting only the distinct ones).

The product of its (nonzero) digits is 840000, while the sum is 45.

The spelling of 221545351501740 in words is "two hundred twenty-one trillion, five hundred forty-five billion, three hundred fifty-one million, five hundred one thousand, seven hundred forty".