25784980971 has 4 divisors (see below), whose sum is σ = 34379974632. Its totient is φ = 17189987312.

The previous prime is 25784980931. The next prime is 25784981107. The reversal of 25784980971 is 17908948752.

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 25784980971 - 2¹⁹ = 25784456683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25784980931) 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, 4297496826 + ... + 4297496831.

It is an arithmetic number, because the mean of its divisors is an integer number (8594993658).

Almost surely, 2^25784980971 is an apocalyptic number.

25784980971 is a deficient number, since it is larger than the sum of its proper divisors (8594993661).

25784980971 is an equidigital number, since it uses as much as digits as its factorization.

25784980971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8594993660.

The product of its (nonzero) digits is 10160640, while the sum is 60.

The spelling of 25784980971 in words is "twenty-five billion, seven hundred eighty-four million, nine hundred eighty thousand, nine hundred seventy-one".