25025378765 has 4 divisors (see below), whose sum is σ = 30030454524. Its totient is φ = 20020303008.

The previous prime is 25025378761. The next prime is 25025378789. The reversal of 25025378765 is 56787352052.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13462032676 + 11563346089 = 116026^2 + 107533^2 .

It is a cyclic number.

It is not a de Polignac number, because 25025378765 - 2² = 25025378761 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25025378761) 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, 2502537872 + ... + 2502537881.

It is an arithmetic number, because the mean of its divisors is an integer number (7507613631).

Almost surely, 2^25025378765 is an apocalyptic number.

It is an amenable number.

25025378765 is a deficient number, since it is larger than the sum of its proper divisors (5005075759).

25025378765 is an equidigital number, since it uses as much as digits as its factorization.

25025378765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5005075758.

The product of its (nonzero) digits is 3528000, while the sum is 50.

The spelling of 25025378765 in words is "twenty-five billion, twenty-five million, three hundred seventy-eight thousand, seven hundred sixty-five".