256715001671 has 8 divisors (see below), whose sum is σ = 259392806400. Its totient is φ = 254040763032.

The previous prime is 256715001637. The next prime is 256715001677. The reversal of 256715001671 is 176100517652.

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 256715001671 - 2¹⁴ = 256714985287 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 (256715001677) 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, 746675 + ... + 1034868.

It is an arithmetic number, because the mean of its divisors is an integer number (32424100800).

Almost surely, 2^256715001671 is an apocalyptic number.

256715001671 is a deficient number, since it is larger than the sum of its proper divisors (2677804729).

256715001671 is a wasteful number, since it uses less digits than its factorization.

256715001671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783045.

The product of its (nonzero) digits is 88200, while the sum is 41.

The spelling of 256715001671 in words is "two hundred fifty-six billion, seven hundred fifteen million, one thousand, six hundred seventy-one".