25748505697 has 4 divisors (see below), whose sum is σ = 25912509076. Its totient is φ = 25584502320.

The previous prime is 25748505691. The next prime is 25748505701. The reversal of 25748505697 is 79650584752.

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 13655324736 + 12093180961 = 116856^2 + 109969^2 .

It is a cyclic number.

It is not a de Polignac number, because 25748505697 - 2²⁷ = 25614287969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25748505691) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 82001454 + ... + 82001767.

It is an arithmetic number, because the mean of its divisors is an integer number (6478127269).

Almost surely, 2^25748505697 is an apocalyptic number.

It is an amenable number.

25748505697 is a deficient number, since it is larger than the sum of its proper divisors (164003379).

25748505697 is a wasteful number, since it uses less digits than its factorization.

25748505697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164003378.

The product of its (nonzero) digits is 21168000, while the sum is 58.

The spelling of 25748505697 in words is "twenty-five billion, seven hundred forty-eight million, five hundred five thousand, six hundred ninety-seven".