19716256317 has 8 divisors (see below), whose sum is σ = 26290333696. Its totient is φ = 13143174912.

The previous prime is 19716256291. The next prime is 19716256349. The reversal of 19716256317 is 71365261791.

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

It is not a de Polignac number, because 19716256317 - 2¹² = 19716252221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19716256367) 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, 201508 + ... + 282909.

It is an arithmetic number, because the mean of its divisors is an integer number (3286291712).

Almost surely, 2^19716256317 is an apocalyptic number.

It is an amenable number.

19716256317 is a deficient number, since it is larger than the sum of its proper divisors (6574077379).

19716256317 is a wasteful number, since it uses less digits than its factorization.

19716256317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497987.

The product of its digits is 476280, while the sum is 48.

The spelling of 19716256317 in words is "nineteen billion, seven hundred sixteen million, two hundred fifty-six thousand, three hundred seventeen".