256105610651 has 4 divisors (see below), whose sum is σ = 279387938904. Its totient is φ = 232823282400.

The previous prime is 256105610647. The next prime is 256105610671. The reversal of 256105610651 is 156016501652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256105610651 - 2² = 256105610647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256105610611) 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, 11641164110 + ... + 11641164131.

It is an arithmetic number, because the mean of its divisors is an integer number (69846984726).

Almost surely, 2^256105610651 is an apocalyptic number.

256105610651 is a deficient number, since it is larger than the sum of its proper divisors (23282328253).

256105610651 is a wasteful number, since it uses less digits than its factorization.

256105610651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23282328252.

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 256105610651 in words is "two hundred fifty-six billion, one hundred five million, six hundred ten thousand, six hundred fifty-one".