25777697652 has 144 divisors (see below), whose sum is σ = 80027176320. Its totient is φ = 6828281856.

The previous prime is 25777697591. The next prime is 25777697707. The reversal of 25777697652 is 25679677752.

25777697652 is a `hidden beast` number, since 2 + 577 + 7 + 6 + 9 + 7 + 6 + 52 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 25777697652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 242124 + ... + 331932.

It is an arithmetic number, because the mean of its divisors is an integer number (555744280).

Almost surely, 2^25777697652 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25777697652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40013588160).

25777697652 is an abundant number, since it is smaller than the sum of its proper divisors (54249478668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25777697652 is a wasteful number, since it uses less digits than its factorization.

25777697652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89910 (or 89905 counting only the distinct ones).

The product of its digits is 77792400, while the sum is 63.

The spelling of 25777697652 in words is "twenty-five billion, seven hundred seventy-seven million, six hundred ninety-seven thousand, six hundred fifty-two".