25203397091 has 2 divisors, whose sum is σ = 25203397092. Its totient is φ = 25203397090.

The previous prime is 25203397067. The next prime is 25203397103. The reversal of 25203397091 is 19079330252.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25203397091 - 2³⁰ = 24129655267 is a prime.

It is a super-2 number, since 2×25203397091² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25203397031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12601698545 + 12601698546.

It is an arithmetic number, because the mean of its divisors is an integer number (12601698546).

Almost surely, 2^25203397091 is an apocalyptic number.

25203397091 is a deficient number, since it is larger than the sum of its proper divisors (1).

25203397091 is an equidigital number, since it uses as much as digits as its factorization.

25203397091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 41.

The spelling of 25203397091 in words is "twenty-five billion, two hundred three million, three hundred ninety-seven thousand, ninety-one".