25724601097 has 4 divisors (see below), whose sum is σ = 27703416580. Its totient is φ = 23745785616.

The previous prime is 25724601083. The next prime is 25724601101. The reversal of 25724601097 is 79010642752.

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 17055315216 + 8669285881 = 130596^2 + 93109^2 .

It is a cyclic number.

It is not a de Polignac number, because 25724601097 - 2⁷ = 25724600969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25724601797) 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, 989407722 + ... + 989407747.

It is an arithmetic number, because the mean of its divisors is an integer number (6925854145).

Almost surely, 2^25724601097 is an apocalyptic number.

It is an amenable number.

25724601097 is a deficient number, since it is larger than the sum of its proper divisors (1978815483).

25724601097 is a wasteful number, since it uses less digits than its factorization.

25724601097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978815482.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 25724601097 in words is "twenty-five billion, seven hundred twenty-four million, six hundred one thousand, ninety-seven".