256052445646 has 4 divisors (see below), whose sum is σ = 384078668472. Its totient is φ = 128026222822.

The previous prime is 256052445643. The next prime is 256052445647. The reversal of 256052445646 is 646544250652.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 256052445646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256052445643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64013111410 + ... + 64013111413.

It is an arithmetic number, because the mean of its divisors is an integer number (96019667118).

Almost surely, 2^256052445646 is an apocalyptic number.

256052445646 is a deficient number, since it is larger than the sum of its proper divisors (128026222826).

256052445646 is a wasteful number, since it uses less digits than its factorization.

256052445646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128026222825.

The product of its (nonzero) digits is 6912000, while the sum is 49.

The spelling of 256052445646 in words is "two hundred fifty-six billion, fifty-two million, four hundred forty-five thousand, six hundred forty-six".