2171742881645 has 8 divisors (see below), whose sum is σ = 2607877684320. Its totient is φ = 1736203487760.

The previous prime is 2171742881563. The next prime is 2171742881699. The reversal of 2171742881645 is 5461882471712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2171742881645 - 2⁴⁰ = 1072231253869 is a prime.

It is a super-3 number, since 3×2171742881645³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148844171 + ... + 148858760.

It is an arithmetic number, because the mean of its divisors is an integer number (325984710540).

Almost surely, 2^{2171742881645} is an apocalyptic number.

It is an amenable number.

2171742881645 is a deficient number, since it is larger than the sum of its proper divisors (436134802675).

2171742881645 is a wasteful number, since it uses less digits than its factorization.

2171742881645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297704395.

The product of its digits is 6021120, while the sum is 56.

The spelling of 2171742881645 in words is "two trillion, one hundred seventy-one billion, seven hundred forty-two million, eight hundred eighty-one thousand, six hundred forty-five".