256346165101 has 4 divisors (see below), whose sum is σ = 276065100892. Its totient is φ = 236627229312.

The previous prime is 256346165083. The next prime is 256346165137. The reversal of 256346165101 is 101561643652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83062122025 + 173284043076 = 288205^2 + 416274^2 .

It is a cyclic number.

It is not a de Polignac number, because 256346165101 - 2¹⁵ = 256346132333 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 (256346115101) 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, 9859467876 + ... + 9859467901.

It is an arithmetic number, because the mean of its divisors is an integer number (69016275223).

Almost surely, 2^256346165101 is an apocalyptic number.

It is an amenable number.

256346165101 is a deficient number, since it is larger than the sum of its proper divisors (19718935791).

256346165101 is a wasteful number, since it uses less digits than its factorization.

256346165101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19718935790.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 256346165101 in words is "two hundred fifty-six billion, three hundred forty-six million, one hundred sixty-five thousand, one hundred one".