171994740465 has 16 divisors (see below), whose sum is σ = 277358450688. Its totient is φ = 91008239616.

The previous prime is 171994740377. The next prime is 171994740479. The reversal of 171994740465 is 564047499171.

It is not a de Polignac number, because 171994740465 - 2²³ = 171986351857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45141072 + ... + 45144881.

It is an arithmetic number, because the mean of its divisors is an integer number (17334903168).

Almost surely, 2^171994740465 is an apocalyptic number.

171994740465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

171994740465 is a deficient number, since it is larger than the sum of its proper divisors (105363710223).

171994740465 is a wasteful number, since it uses less digits than its factorization.

171994740465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90286088.

The product of its (nonzero) digits is 7620480, while the sum is 57.

The spelling of 171994740465 in words is "one hundred seventy-one billion, nine hundred ninety-four million, seven hundred forty thousand, four hundred sixty-five".