25800091007 has 4 divisors (see below), whose sum is σ = 26089979760. Its totient is φ = 25510202256.

The previous prime is 25800090991. The next prime is 25800091087. The reversal of 25800091007 is 70019000852.

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

It is a cyclic number.

It is not a de Polignac number, because 25800091007 - 2⁴ = 25800090991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25800091087) 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, 144944243 + ... + 144944420.

It is an arithmetic number, because the mean of its divisors is an integer number (6522494940).

Almost surely, 2^25800091007 is an apocalyptic number.

25800091007 is a deficient number, since it is larger than the sum of its proper divisors (289888753).

25800091007 is an equidigital number, since it uses as much as digits as its factorization.

25800091007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289888752.

The product of its (nonzero) digits is 5040, while the sum is 32.

Adding to 25800091007 its reverse (70019000852), we get a palindrome (95819091859).

The spelling of 25800091007 in words is "twenty-five billion, eight hundred million, ninety-one thousand, seven".