256164997 has 8 divisors (see below), whose sum is σ = 288467712. Its totient is φ = 225364800.

The previous prime is 256164991. The next prime is 256165003. The reversal of 256164997 is 799461652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (256164991) and next prime (256165003).

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 256164997 - 2³ = 256164989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256164997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256164991) 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, 375268 + ... + 375949.

It is an arithmetic number, because the mean of its divisors is an integer number (36058464).

Almost surely, 2^256164997 is an apocalyptic number.

It is an amenable number.

256164997 is a deficient number, since it is larger than the sum of its proper divisors (32302715).

256164997 is a wasteful number, since it uses less digits than its factorization.

256164997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751259.

The product of its digits is 816480, while the sum is 49.

The square root of 256164997 is about 16005.1553257068. The cubic root of 256164997 is about 635.0968062880.

The spelling of 256164997 in words is "two hundred fifty-six million, one hundred sixty-four thousand, nine hundred ninety-seven".