25211781464 has 8 divisors (see below), whose sum is σ = 47272090260. Its totient is φ = 12605890728.

The previous prime is 25211781443. The next prime is 25211781487. The reversal of 25211781464 is 46418711252.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1575736334 + ... + 1575736349.

Almost surely, 2^25211781464 is an apocalyptic number.

It is an amenable number.

25211781464 is a deficient number, since it is larger than the sum of its proper divisors (22060308796).

25211781464 is a wasteful number, since it uses less digits than its factorization.

25211781464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3151472689 (or 3151472685 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The spelling of 25211781464 in words is "twenty-five billion, two hundred eleven million, seven hundred eighty-one thousand, four hundred sixty-four".