256342012153 has 4 divisors (see below), whose sum is σ = 260686792080. Its totient is φ = 251997232228.

The previous prime is 256342012151. The next prime is 256342012193. The reversal of 256342012153 is 351210243652.

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 not a de Polignac number, because 256342012153 - 2¹ = 256342012151 is a prime.

It is a super-2 number, since 2×256342012153² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256342012151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2172389875 + ... + 2172389992.

It is an arithmetic number, because the mean of its divisors is an integer number (65171698020).

Almost surely, 2^256342012153 is an apocalyptic number.

It is an amenable number.

256342012153 is a deficient number, since it is larger than the sum of its proper divisors (4344779927).

256342012153 is an equidigital number, since it uses as much as digits as its factorization.

256342012153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4344779926.

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 256342012153 in words is "two hundred fifty-six billion, three hundred forty-two million, twelve thousand, one hundred fifty-three".