25778002568 has 8 divisors (see below), whose sum is σ = 48333754830. Its totient is φ = 12889001280.

The previous prime is 25778002567. The next prime is 25778002609. The reversal of 25778002568 is 86520087752.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18828779524 + 6949223044 = 137218^2 + 83362^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (25778002561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1611125153 + ... + 1611125168.

Almost surely, 2^25778002568 is an apocalyptic number.

It is an amenable number.

25778002568 is a deficient number, since it is larger than the sum of its proper divisors (22555752262).

25778002568 is a wasteful number, since it uses less digits than its factorization.

25778002568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3222250327 (or 3222250323 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 50.

The spelling of 25778002568 in words is "twenty-five billion, seven hundred seventy-eight million, two thousand, five hundred sixty-eight".