2171774005636 has 9 divisors (see below), whose sum is σ = 3800609667799. Its totient is φ = 1085885529124.

The previous prime is 2171774005619. The next prime is 2171774005679. The reversal of 2171774005636 is 6365004771712.

The square root of 2171774005636 is 1473694.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2171774005636.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2578965 + ... + 3315811.

Almost surely, 2^{2171774005636} is an apocalyptic number.

2171774005636 is the 1473694-th square number.

It is an amenable number.

2171774005636 is a deficient number, since it is larger than the sum of its proper divisors (1628835662163).

2171774005636 is an frugal number, since it uses more digits than its factorization.

2171774005636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473698 (or 736849 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 49.

Multiplying 2171774005636 by its sum of digits (49), we get a square (106416926276164 = 10315858²).

The spelling of 2171774005636 in words is "two trillion, one hundred seventy-one billion, seven hundred seventy-four million, five thousand, six hundred thirty-six".