25079156497 has 4 divisors (see below), whose sum is σ = 25422706660. Its totient is φ = 24735606336.

The previous prime is 25079156477. The next prime is 25079156513. The reversal of 25079156497 is 79465197052.

It is a happy number.

It is a Cunningham number, because it is equal to 158364²+1.

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 14236307856 + 10842848641 = 119316^2 + 104129^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25079156497 is a prime.

It is a super-2 number, since 2×25079156497² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25079156477) 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, 171774972 + ... + 171775117.

It is an arithmetic number, because the mean of its divisors is an integer number (6355676665).

Almost surely, 2^25079156497 is an apocalyptic number.

It is an amenable number.

25079156497 is a deficient number, since it is larger than the sum of its proper divisors (343550163).

25079156497 is an equidigital number, since it uses as much as digits as its factorization.

25079156497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343550162.

The product of its (nonzero) digits is 4762800, while the sum is 55.

The spelling of 25079156497 in words is "twenty-five billion, seventy-nine million, one hundred fifty-six thousand, four hundred ninety-seven".