2172642954890 has 16 divisors (see below), whose sum is σ = 3912958114632. Its totient is φ = 868568116224.

The previous prime is 2172642954871. The next prime is 2172642954893. The reversal of 2172642954890 is 984592462712.

It can be written as a sum of positive squares in 4 ways, for example, as 1946948599561 + 225694355329 = 1395331^2 + 475073^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2172642954893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61114559 + ... + 61150098.

Almost surely, 2^{2172642954890} is an apocalyptic number.

2172642954890 is a deficient number, since it is larger than the sum of its proper divisors (1740315159742).

2172642954890 is a wasteful number, since it uses less digits than its factorization.

2172642954890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122266441.

The product of its (nonzero) digits is 17418240, while the sum is 59.

The spelling of 2172642954890 in words is "two trillion, one hundred seventy-two billion, six hundred forty-two million, nine hundred fifty-four thousand, eight hundred ninety".