25256664067 has 4 divisors (see below), whose sum is σ = 26354779920. Its totient is φ = 24158548216.

The previous prime is 25256664061. The next prime is 25256664089. The reversal of 25256664067 is 76046665252.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25256664067 is a prime.

It is a super-3 number, since 3×25256664067³ (a number of 32 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25256664067.

It is not an unprimeable number, because it can be changed into a prime (25256664061) 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, 549057892 + ... + 549057937.

It is an arithmetic number, because the mean of its divisors is an integer number (6588694980).

Almost surely, 2^25256664067 is an apocalyptic number.

25256664067 is a deficient number, since it is larger than the sum of its proper divisors (1098115853).

25256664067 is a wasteful number, since it uses less digits than its factorization.

25256664067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098115852.

The product of its (nonzero) digits is 3628800, while the sum is 49.

The spelling of 25256664067 in words is "twenty-five billion, two hundred fifty-six million, six hundred sixty-four thousand, sixty-seven".