2172394723465 has 8 divisors (see below), whose sum is σ = 2606887110600. Its totient is φ = 1737906817152.

The previous prime is 2172394723439. The next prime is 2172394723469. The reversal of 2172394723465 is 5643274932712.

It can be written as a sum of positive squares in 4 ways, for example, as 791027023609 + 1381367699856 = 889397^2 + 1175316^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2172394723465 - 2¹⁷ = 2172394592393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2172394723469) 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, 59311 + ... + 2085259.

It is an arithmetic number, because the mean of its divisors is an integer number (325860888825).

Almost surely, 2^{2172394723465} is an apocalyptic number.

It is an amenable number.

2172394723465 is a deficient number, since it is larger than the sum of its proper divisors (434492387135).

2172394723465 is a wasteful number, since it uses less digits than its factorization.

2172394723465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2240411.

The product of its digits is 15240960, while the sum is 55.

The spelling of 2172394723465 in words is "two trillion, one hundred seventy-two billion, three hundred ninety-four million, seven hundred twenty-three thousand, four hundred sixty-five".