16172581123394 has 8 divisors (see below), whose sum is σ = 24259710917820. Its totient is φ = 8086010817456.

The previous prime is 16172581123393. The next prime is 16172581123399. The reversal of 16172581123394 is 49332118527161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14025661657225 + 2146919466169 = 3745085^2 + 1465237^2 .

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

It is not an unprimeable number, because it can be changed into a prime (16172581123393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139799849 + ... + 139915484.

Almost surely, 2^{16172581123394} is an apocalyptic number.

16172581123394 is a deficient number, since it is larger than the sum of its proper divisors (8087129794426).

16172581123394 is a wasteful number, since it uses less digits than its factorization.

16172581123394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279744244.

The product of its digits is 2177280, while the sum is 53.

The spelling of 16172581123394 in words is "sixteen trillion, one hundred seventy-two billion, five hundred eighty-one million, one hundred twenty-three thousand, three hundred ninety-four".