256506101201 has 4 divisors (see below), whose sum is σ = 293149829952. Its totient is φ = 219862372452.

The previous prime is 256506101177. The next prime is 256506101239. The reversal of 256506101201 is 102101605652.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256506101201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256506001201) 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, 18321864365 + ... + 18321864378.

It is an arithmetic number, because the mean of its divisors is an integer number (73287457488).

Almost surely, 2^256506101201 is an apocalyptic number.

It is an amenable number.

256506101201 is a deficient number, since it is larger than the sum of its proper divisors (36643728751).

256506101201 is an equidigital number, since it uses as much as digits as its factorization.

256506101201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36643728750.

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 256506101201 its reverse (102101605652), we get a palindrome (358607706853).

The spelling of 256506101201 in words is "two hundred fifty-six billion, five hundred six million, one hundred one thousand, two hundred one".