2171745280440 has 96 divisors (see below), whose sum is σ = 7058833095600. Its totient is φ = 579077844480.

The previous prime is 2171745280339. The next prime is 2171745280447. The reversal of 2171745280440 is 440825471712.

2171745280440 is a `hidden beast` number, since 2 + 17 + 1 + 74 + 52 + 80 + 440 = 666.

It is a super-2 number, since 2×2171745280440² (a number of 25 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171745280447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3643035 + ... + 4197045.

Almost surely, 2^{2171745280440} is an apocalyptic number.

2171745280440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2171745280440 is an abundant number, since it is smaller than the sum of its proper divisors (4887087815160).

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

2171745280440 is a wasteful number, since it uses less digits than its factorization.

2171745280440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564917 (or 564910 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 45.

The spelling of 2171745280440 in words is "two trillion, one hundred seventy-one billion, seven hundred forty-five million, two hundred eighty thousand, four hundred forty".